File check

Check My File

Find out what type of file you have and why it might not work where you need it. Check its format and properties, then choose a tool to convert or fix it.

Selected: {{ selectedDestinationProfile.preset.label }}. Review rules.

Choose a file to check

Check images, PDFs, audio, video, text, ZIP archives, and modern Office files. Available details depend on the format.

or drop one file here

Files stay on your device.

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Try a sample

See a sample report before choosing your own file.

Will this upload?

Copy the rules from the website or form you plan to use. Leave any rule blank when it does not apply.

Choose a destination to check its published requirements, or enter your own rules below. Browse the sourced rules.

Something else

Effective from {{ selectedDestinationProfile.preset.effectiveFrom }}. Before that date, this is a readiness check.

Applies through {{ selectedDestinationProfile.preset.effectiveUntil }}.

You changed these rules. The check uses your edits. The source links describe the original requirements.

{{ rule.kind }} {{ rule.label }} checked here read and check manually
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Official source: {{ source.publisher }}

Limits these checks do not cover

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No acceptance guarantee. {{ selectedDestinationProfile.preset.acceptanceDisclaimer }}

Or start with a generic rule example

These examples are not destination requirements. They replace the current rules and can be changed.

File basics

Size uses decimal upload limits: 1 MB is exactly 1,000,000 bytes. Formats are checked against the detected contents, not just the file name.

Maximum file size

Leave blank for no size limit. {{ requirementFieldError('maxSize') }}

Allowed formats Separate extensions with commas or spaces. {{ requirementFieldError('allowedFormats') }}

Pixel dimensions

These rules apply to images and videos. Enter only the minimums or maximums the upload form gives you.

{{ field.label }} (px) {{ requirementFieldError(field.key) }}

Maximum total pixels Width × height. For a 64-megapixel limit, enter 64000000. {{ requirementFieldError('maxPixels') }}

Aspect ratio

Enter both sides, such as 16 and 9. Tolerance allows small crops or rounding differences.

Required ratio

Tolerance (%) 0% means an exact ratio. Maximum 50%. {{ requirementFieldError('aspectTolerance') }}

Image behavior

Use these only when the destination explicitly rejects animation or transparent pixels.

Must be a still imageFails when multiple animation frames are detected. Must not contain transparencyChecks decoded pixels when the browser can safely sample them.

PDF rules

These custom rules require a PDF. Destination presets may skip PDF-only checks for other accepted formats. Text is checked on up to the first five pages.

Maximum number of pages Leave blank when page count does not matter. {{ requirementFieldError('maxPdfPages') }}

Must contain selectable textChecks text on up to the first five PDF pages. Must open without a passwordFails when password protection is detected.

Fix the highlighted rule fields before relying on the upload result.

Your file details appear here

See the detected format, file details, and results for your upload requirements, with suggested fixes where available.

Code: {{ failure.code }}

The diagnostic contains an error code, browser, detected format if available, and a size range. It excludes the file name and contents.

Detected from file contents

What we could verify

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Sample of archive entries

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Will this upload?

Fix the highlighted upload rules The file result is paused until every entered rule is valid.

No upload rules are active. Add the limits from the form you plan to use, and this result will update without reading the file again.

Checks and cautions

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Useful next steps

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No matching converter was found. Try opening the file in its usual app, or tell us which format you need help with.

Open tool without the file

Choose the right product-image original

If the image is too small, use a larger original. Google advises against enlarging thumbnails. Conversion can also remove AI-source metadata that Google requires.

Review the dated image rules and what this check cannot establish before editing or publishing.

Did this file check help?

JPEGConvert adds your Yes/No answer, optional reason, and detected format to the site’s analytics event. Standard analytics context may also apply. We do not add your file name or contents.

What this check can—and cannot—tell you

Some details can be checked directly. Others need a closer look in the app or website where you will use the file.

Strong evidence

Recognized file signatures and container structures
Exact byte size and extension comparison
Properties decoded by this browser, such as dimensions or duration
Text found on the sampled PDF pages

Needs context

Whether a particular website will accept the file
Whether every PDF page is searchable when only five are sampled
Whether an uncommon codec works in another device or app
Whether a damaged file can be repaired safely

How to check a file before using it

Choose a file

Select one file or try a sample to see how the check works.

Review the results

Compare the real format, extension, useful properties, and every upload rule you entered.

Fix a problem

Open a suggested tool with your file, then review the changes before downloading.

Check the real format

Compare recognizable file signatures, the browser type, and the filename extension instead of trusting the name alone.

Useful file details

See the properties the browser can verify, such as dimensions, pages, duration, encryption, or searchable PDF text.

Find a tool for the job

Find converters, compressors, and other tools that support your file and the change you need.

Requirement checks

Check common goals such as a size limit, a searchable PDF, or a broadly supported web image.

Original file unchanged

The checker does not repair, convert, rename, or otherwise change the selected file.

Frequently Asked Questions

No. The checker reads the file to show its properties. It does not rename, convert, or change the original.

A file can be renamed without converting its contents. The checker compares recognizable bytes with the extension and browser-provided type to flag likely mismatches.

It reports basic details for any selected file and can inspect additional properties for common images, PDFs, audio, and video when the browser supports that format.

It checks sampled pages for usable text. Little or no extracted text can indicate scanned pages, but mixed documents and decorative text still require a visual check.

No. It explains what could be read and recommends a compatible tool or recovery step. Keep the original file until you have verified any converted result.

No browser tool can guarantee every codec, damaged file, or unusually large document. Each recommendation explains what the tool can change and any known limits.

Need a hand with your file?

Check the supported formats and settings for your task. If the result isn’t what you expected, our support page can help you find the next step.

Get help | Contact support

Check My File

Choose a file to check

Where will you use this file?

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Your file details appear here

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What we could verify

Will this upload?

Useful fixes for this result

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Checks and cautions

Useful next steps

Choose the right product-image original

Did this file check help?

What this check can—and cannot—tell you

Strong evidence

Needs context

How to check a file before using it

Choose a file

Review the results

Fix a problem

Check the real format

Useful file details

Find a tool for the job

Requirement checks

Original file unchanged

Frequently Asked Questions

Need a hand with your file?

Check My File

Choose a file to check

Where will you use this file?

{{ selectedDestinationProfile.preset.label }}

Your file details appear here

{{ failure.title }}

What we could verify

Will this upload?

Useful fixes for this result

{{ plan.title }}

{{ item.title }}

Checks and cautions

Useful next steps

Choose the right product-image original

Did this file check help?

What this check can—and cannot—tell you

Strong evidence

Needs context

How to check a file before using it

Choose a file

Review the results

Fix a problem

Check the real format

Useful file details

Find a tool for the job

Requirement checks

Original file unchanged

Frequently Asked Questions

Does checking a file change it?

Why can the real format differ from the extension?

What can the checker inspect?

Can it tell whether a PDF is scanned?

Does it repair damaged files?

Are recommendations guaranteed to work with every file?

Need a hand with your file?