Testing and validation are two halves of the same job. Validation asks whether the file follows the rules, and testing asks whether the book works for the reader. A book can pass every validator and still show a heading in the wrong place on a Kobo, drop a drop cap on an iPad, hide the cover on a Kindle or fail to apply dark mode properly. Ebook testing and validation is the combination: an automated check of the file against the standards, followed by a human check on the devices that readers use.
eBook Testing and Validation · from $169
eBook testing and validation that checks your book on real devices before readers do
eBook testing and validation proves that your file works where readers actually use it, from a Kindle Paperwhite to an iPhone and a Kobo tablet. Our ebook testing and validation services run EPUBCheck, open the book in the official previewers and on real devices, and give you a written report of what we found and fixed. Choose a word count to see a fixed price for testing your own file now.
View Pricing
Most books are tested and reported within three working days.
- Real Kindle, Kobo and Apple devices
- Official previewers used
- Written test report included
Key facts
- $169Starting price for the ebook testing, before extras
- 2 roundsOf revisions included in every ebook testing order
- 2 to 3 daysFastest standard delivery for a short ebook testing
Overview
What an ebook testing actually involves
The tests we run start with EPUBCheck, which finds structural errors. They continue with Kindle Previewer, which shows how the file converts and displays on a range of Kindle devices. They go on to real apps: Apple Books on iPhone and iPad, Kobo apps, Google Play Books, and where possible real e-readers. In each environment we check the cover, the contents, the first and last pages, a sample of chapters, images, tables, footnotes and special elements. We repeat with larger and smaller fonts, different margins and light, sepia and dark themes. We click every link.
The result is a report that tells you what we tested, what we found and what we recommend, with screenshots from the devices. We separate problems that block publication from those that affect only one device, and we explain which can be fixed and which are limitations of the platform. If you ask, we fix them and re-test. The service suits authors, publishers and agencies who want to know that a book will look right before it goes on sale.
We start every ebook testing and validation job with an audit. For a ebook testing, we open your file or manuscript, list what is already right, what is wrong and what needs a decision from you, and send that back before any work begins. The audit is why there are no surprises: you know the scope, the price and the schedule, and you know which of device testing and validators is likely to need the most care.
Kindle Previewer errors fix requests come from authors who see warnings they do not understand, and we explain and resolve each one. Our ebook testing for Kobo and Apple Books covers devices and previewers as well as Kindle, with a plain report.
Why it matters
Why an ebook testing matters
Ebook testing and validation shapes the reading experience
Readers use many devices, and each exposes different faults. Readers rarely name the cause, but they feel the difference between careful and careless ebook testing and validation work. The effect is cumulative: each small decision in ebook testing and validation supports the next, so the book gains authority page by page.
The details carry the quality
Retailers differ in what they tolerate. Each detail in ebook testing and validation has a tolerance, and a professional knows where it lies and how to check it. None of this is visible when it is done well, which is exactly why careful ebook testing and validation work is easy to undervalue.
Doing it once, properly, saves time
A written report gives you a clear list of fixes. Getting ebook testing and validation right at the start also keeps later edits, reprints and new editions inexpensive. It is far easier to get ebook testing and validation right while the book is still a working file than to repair it after publication.
Testing that goes beyond one screen
Ebook device compatibility testing
Our testing combines software checks with real devices. We validate the file, open it in the Kindle Previewer on the device profiles Amazon provides, and then check it in Apple Books, Kobo and other reading apps, because each uses a different engine and each has its own strengths and quirks.
For ebook testing on kindle devices, we look at a Paperwhite style e-ink view, a tablet view and a phone view, and we check the Go To menu, the font controls and the image display. If you want to test epub on multiple devices, we apply the same checklist to Apple Books, Kobo and Google Play Books and we note any difference.
Ebook preview testing before publishing is also a good moment to check the files that stores show in their sample, since readers often judge a book from the first pages. We test the sample view, the cover reference and the first chapters, and we report anything that would put readers off.
- Official previewers and real devices combined
- Phone, tablet and e-ink views checked
- A written report listing findings and fixes
Choose the right build
The first decision in any ebook testing
Test and report
A report with screenshots. We choose this route when the book leans on device testing, and we show a sample before the whole ebook testing and validation job proceeds. We show a sample of each route where it helps, so you can choose from evidence rather than from a description on this ebook testing project.
Test and fix
A report plus corrections. We choose this route when validators are central to how the book is used, and we explain the cost and schedule consequences before you commit. We show a sample of each route where it helps, so you can choose from evidence rather than from a description on this ebook testing project.
Specification
The ebook testing specification we build to
These are the decisions we make on every ebook testing job, and the reason for each one.
Element
How we build it
Why it matters
Devices
Kindle, Kobo, iOS, Android. We confirm the value with you before building, and record it in the specification for your ebook testing and validation job.
Covers most readers. Getting this right early avoids rework once the ebook testing and validation pages have been proofed.
Validators
EPUBCheck and retailer tools. We apply it through a defined style or setting, so it holds across the whole ebook testing and validation file.
Catches errors. On this ebook testing job, readers and reviewers notice when it is wrong, even when they cannot say what is wrong.
Links
Every link tested. We verify it again in the final proof, because it is easy to disturb during late edits with your ebook testing.
Navigation works. Platforms and printers check it automatically, and a failure delays the launch on this ebook testing project.
Settings
Large type, night mode, sepia. Where your platform sets a different rule, we follow the platform and tell you why on this ebook testing project.
Holds under reader choices. It also keeps later editions of the ebook testing and validation work consistent with the first.
Files
A test report, a device matrix and fix recommendations, named consistently and delivered with a short specification.
A clear package prevents mix-ups between versions and speeds up any later change for the ebook testing. Getting this right early avoids rework once the ebook testing and validation pages have been proofed.
Checks
Preflight or validation run on every deliverable, with the report supplied in this ebook testing order. We apply it through a defined style or setting, so it holds across the whole ebook testing and validation file.
Evidence of a clean pass is what separates a checked file from a hopeful one on this ebook testing project. On this ebook testing job, readers and reviewers notice when it is wrong, even when they cannot say what is wrong.
See what it costs
See the price of your ebook testing in a minute
Pick a word count to see what testing your own ebook costs, with the delivery estimate and any extras shown before you decide.
Build my priceProcess
How an ebook testing project runs
Send
You send the files and tell us what you need from the ebook testing and validation job, including where you plan to publish and any deadline. We confirm the scope and the price for the ebook testing. You are never left guessing what comes next, because we confirm each stage of the ebook testing and validation job in writing.
Day 1
Audit
For a ebook testing, we examine the file, list what is correct and what must change, and send a short note with any decisions we need from you. For your ebook testing, if something unexpected turns up at this stage, we tell you at once and agree the fix before continuing.
Days 1 to 2
Plan
We agree the specification, including how we will treat device testing and validators, and confirm the schedule. With your ebook testing, this stage is where most questions arise, so we leave time for them in the schedule. You are never left guessing what comes next, because we confirm each stage of the ebook testing and validation job in writing.
Day 2
Build
For your ebook testing, we carry out the work, applying defined styles and settings, and fixing faults at their source rather than covering them. You are never left guessing what comes next, because we confirm each stage of the ebook testing and validation job in writing.
Days 3 to 7
Check
We validate, preview and review the result against the specification, and compare the text with your manuscript for the ebook testing. For your ebook testing, if something unexpected turns up at this stage, we tell you at once and agree the fix before continuing.
Days 8 to 9
Deliver
You receive the files, the specification and the change log, with support if a platform queries the file with your ebook testing. With your ebook testing, this stage is where most questions arise, so we leave time for them in the schedule.
Day 10
Before and after
An ebook before and after testing
The same book shown before testing and after the defects were fixed. The text is the same, and the experience is better.
123Before
- 1A chapter link that goes to the wrong place
- 2An image that is cropped on a phone
- 3Odd spacing in the Kindle Previewer
123After
- 1Every chapter link tested and working
- 2Images that display fully on every screen
- 3Consistent spacing across the previewer profiles
- 3problems found in the first review
- 3fixes checked in the final review
- 1named specialist owning every fix
- Fixedprice confirmed in the calculator before you order
Fewer reviews about formatting
Readers do not meet the defects that testing removes.
Confidence at launch
You know the book was checked on the devices that matter.
A record of the checks
The report documents what was tested and what was fixed.
Pricing calculator
Build your ebook testing price
A file that passes a validator can still look wrong on a Kobo, a phone or a Kindle. Choose how thorough you want the testing to be and see the fixed price for checking your ebook on the devices and apps your readers use.
Beyond our online limit? Let us quote it properly.
An ebook above 150,000 words, or with more than 150 images, is quoted individually. Send us the file and we reply with a fixed price and a delivery date.
The price covers testing and the reports and fixes you chose. Rewriting content, redesign and retailer fees are not included with your ebook testing.
Price guide
eBook Testing and Validation cost at a glance
The table lists ebook testing and validation cost by length, with the base price, delivery time and the kind of book that fits each tier. The calculator adds extras to your ebook testing for an exact total.
Word count
Base price
Standard delivery
Typical book
Very short text
$169
2-3 working days
Very short text
Short text
$209
3-4 working days
Short text
Compact text
$259
3-5 working days
Compact text
Short book
$329
4-6 working days
Short book
Standard length
$399
5-7 working days
Standard length
Full-length text
$469
5-8 working days
Full-length text
Long text
$539
6-9 working days
Long text
Large text
$609
7-10 working days
Large text
Longest online length
$679
8-11 working days
Longest online length
More than 150,000 words
Custom quote
Agreed with your quote
Quoted individually
Comparison
eBook Testing and Validation compared with the alternatives
What you compare
A quick ebook testing and validation fix
Professional ebook testing and validation
Approach
A quick fix treats symptoms and leaves the cause in the file with your ebook testing. That approach saves effort at the start and tends to cost more in repairs once the ebook testing and validation job is live.
A professional ebook testing and validation job finds and corrects the cause. We do this as standard on every ebook testing and validation job, and the evidence comes with your files.
Consistency
For a ebook testing, manual changes vary from page to page. It leaves the cause in place, so the same fault tends to return when the text changes on this ebook testing project.
Defined styles apply identically everywhere. It is built to be repeated, so later editions cost less and match the first for the ebook testing.
Validation
Success is judged by eye on one screen in this ebook testing order. For your ebook testing, it is hard to check, so faults are usually found by readers instead of by the author.
For your ebook testing, success is judged by the platform's own checks and real devices. It is checked by a person and by software before it reaches you, so problems are found early for the ebook testing.
Documentation
With your ebook testing, nothing is recorded, so the next edition starts again. That approach saves effort at the start and tends to cost more in repairs once the ebook testing and validation job is live.
With your ebook testing, a specification and change log are supplied. We do this as standard on every ebook testing and validation job, and the evidence comes with your files.
Risk
For your ebook testing, a rejected upload costs days and may delay a launch. It leaves the cause in place, so the same fault tends to return when the text changes on this ebook testing project.
Files are tested before they reach you, and fixes are covered by the guarantee with your ebook testing.
Cost
For your ebook testing, cheap at first, then repeated whenever something changes. For your ebook testing, it is hard to check, so faults are usually found by readers instead of by the author.
A fixed price and a reusable result on this ebook testing project. It is checked by a person and by software before it reaches you, so problems are found early for the ebook testing.
Our standard
The standard we hold every ebook testing to
Fix causes, not symptoms
Our ebook testing and validation work corrects the underlying structure, so the same problem does not return when the text changes. It is a standard we hold on every ebook testing and validation job, whatever the price of the package or the length of the book.
Evidence over assurance
We supply the validation or preflight report with your files, so a clean result is something you can see for the ebook testing. You can check it for yourself, because the evidence comes with your files for the ebook testing. Holding to it costs us time, and it saves you the cost of repairs later for the ebook testing.
Plain communication
For your ebook testing, we explain what we found and what we did in plain language, and we tell you honestly when something is outside what the file can support. Holding to it costs us time, and it saves you the cost of repairs later for the ebook testing.
Checklist
The pre-delivery checklist for an ebook testing
Every item below is verified on your ebook testing before it leaves our desk.
- Audit completed and agreed with you
- Device testing checked and corrected
- Validators checked and corrected
- Navigation and links checked and corrected
- Type and image checks checked and corrected
- Validation or preflight run with the report supplied
- Previewer and device checks completed
- Text compared with the approved manuscript
- Specification and change log delivered
How we think
How we think about your ebook testing
Structure first
In ebook testing and validation, device testing and validators are built into the file, not painted on top. With your ebook testing, we treat structure as the foundation and appearance as the finish, because structure is what survives edits and platform changes.
Checked, not hoped
For a ebook testing, a file is not finished because it looks right on our screen. For a ebook testing, it is finished when the validator, the preflight and real devices agree, and when we can show you the evidence. It is the principle behind most of what we do on ebook testing and validation, and the reason we prefer to explain our choices rather than hide them.
Your files stay yours
We deliver source files and a specification, and we never lock your ebook testing and validation work inside a proprietary format. With your ebook testing, if you hire someone else later, they can pick up where we stopped.
Client reviews
What authors say about our ebook testing
Verified reviews from authors whose files we tested.
My fantasy EPUB had complex nested structures with chapter epigraphs and world-building inserts. The EPUB handles every level cleanly and reads beautifully on Kindle and Apple Books.
The EPUB renders perfectly on my Kindle, Apple Books, and Kobo. The clickable table of contents works exactly as it should. Clean, standards-compliant, and ready to distribute everywhere.
A fixed-layout EPUB for a cookbook is genuinely complex. The recipe layouts, ingredient lists, and photography all needed to remain pixel-perfect. The result looks as good as the print version on every device.
The reflowable EPUB looks perfect on every device I tested — Kindle, Apple Books, and Kobo. The clickable table of contents and chapter navigation work exactly as they should.
Good eBook formatting work. The tables converted cleanly and the navigation works well. One heading level needed a style adjustment but it was corrected quickly. The file performs well on all platforms.
My EPUB was rejected twice by Apple Books before I found Book Formatting Experts. They identified the metadata errors, rebuilt the file properly, and the new version passed immediately. Wish I had contacted them first.
My business EPUB had tables and callout boxes that needed to be handled carefully. Everything was converted cleanly without losing any structural information. The file passed Amazon's validator on the first check.
I had a previous EPUB that displayed incorrectly on several devices. Book Formatting Experts rebuilt it from scratch. The new version renders beautifully across every reader app I tested.
The interactive elements in my EPUB — internal links, chapter navigation, and resource appendix — all work perfectly. My readers have specifically mentioned how easy the ebook is to navigate.
Academic EPUB with complex equations and references. One formula needed manual correction in revisions but the overall quality was exactly right. The file validates without errors on all platforms.
Converting my nonfiction manuscript to EPUB while preserving the heading structure, footnotes, and internal links was no small task. Every element survived the conversion perfectly.
Cookbook formatting is a specialised skill. The recipe layouts, ingredient column alignment, and index were all formatted beautifully. The food photography placement looks professional and the page flow is logical.
Clean formatting with a professional result. The chapter timeline structure I used was a bit unusual but the formatter handled it well. One revision round to adjust some photo sizing and it was done perfectly.
Business books need to feel authoritative while remaining readable. The interior design achieved both. The chapter structure is clear and every table reads cleanly. My corporate clients have all commented favourably.
Tight, clean, and exactly on brief. The chapter openers had the tension-driven feel the genre demands without being overdone. Upload to KDP was approved without a single correction requested.
My romance novel needed a warm, readable layout with consistent chapter styling. The specialist understood exactly what I was after and the finished file exceeded my expectations on every page.
The interior design reflects the purpose of the book — accessible, warm, and inviting for daily reading. The scripture placement and reflection boxes are formatted consistently throughout. I am genuinely proud of how it looks.
Good formatting work on my early reader book. The large font and generous spacing were applied correctly. One illustration needed repositioning in revisions but it was fixed quickly. Happy with the result.
FAQ
eBook Testing and Validation: questions answered
These are the questions authors ask most about ebook testing and validation, including devices, previewers and cost. If your question about the ebook testing is missing, request a quote and a specialist will reply.
What are ebook testing and validation services?
They are services that check an ebook against standards and test it on devices. For ebook testing and validation, we check the result against the platform's own rules before you see it.
How do I test ebooks on Kindle devices?
Use Kindle Previewer and, where possible, real Kindle devices. We keep a record of what we changed so that you can review the work for the ebook testing.
What is an ebook validation service?
It is a service that runs validators such as EPUBCheck and explains the results. The calculator on this page shows the fixed price for each package before you commit with your ebook testing.
How do I test an EPUB on multiple devices?
Open it in several apps and devices and change fonts and themes. For a ebook testing, if you are unsure, send the file and we will tell you what the job involves.
What is ebook quality assurance?
It is a systematic test of an ebook's structure and display. With your ebook testing, revision rounds are included, so the first delivery does not have to be perfect.
How do I preview an ebook before publishing?
Use Kindle Previewer and the stores' own previewers. For ebook testing and validation, we check the result against the platform's own rules before you see it.
What are Kindle Previewer errors?
They are warnings from Amazon's tool about structure or display, and we fix them. We keep a record of what we changed so that you can review the work for the ebook testing.
Can you test for Kobo and Apple Books?
Yes. The calculator on this page shows the fixed price for each package before you commit with your ebook testing.
What is ebook device compatibility testing?
It is testing the book on a range of devices and apps. For a ebook testing, if you are unsure, send the file and we will tell you what the job involves.
Do you offer ebook testing services?
Yes. With your ebook testing, revision rounds are included, so the first delivery does not have to be perfect.
How much does ebook testing cost?
The calculator on this page shows a fixed price for each package in this ebook testing order. For ebook testing and validation, we check the result against the platform's own rules before you see it.
Can you fix what you find?
Yes, on request. We keep a record of what we changed so that you can review the work for the ebook testing.
Can you test on Kindle devices?
Yes, on Kindle e-ink readers and apps. The calculator on this page shows the fixed price for each package before you commit with your ebook testing.
Do you offer an ebook validation service?
Yes, with a written report. For a ebook testing, if you are unsure, send the file and we will tell you what the job involves.
Can you test an EPUB on multiple devices?
Yes, across the main device families. With your ebook testing, revision rounds are included, so the first delivery does not have to be perfect.
How much does ebook testing and validation cost?
The ebook testing and validation cost starts at $169 for a short book and rises to $679 for the longest length priced online. Ebook testing and validation services are priced by word count and images, and the calculator shows the total.
How long does testing take?
Most books are tested in about three working days, depending on length and the number of fixes. Priority and Express options shorten the schedule for your ebook testing, and the calculator shows an estimate before you pay.
Ready when you are
Ready to start your ebook testing?
A book tested on real devices reaches readers in the shape that you intended. Find your testing price in a minute, or send a larger project and we will quote it.
- Fixed price shown before you pay
- Revision rounds included
- One named specialist, brief to upload