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Attachment compression

How to compress a PDF attachment for chat or email

Different platforms use different file limits. Check the error prompt first, compress the PDF, review the result, and split the file or use another transfer method if needed.

Compress PDF attachment

Use the PDF compression tool below, then download and send the result.

Open full tool
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Drop files here, or click to choose

Supports PDF files

Current limit: one file up to 50MB

Answer block

Quick answer

Different platforms use different file limits. Check the error prompt first, compress the PDF, review the result, and split the file or use another transfer method if needed.

Key steps

  1. 1Read the platform error prompt to confirm size, format, or network issue.
  2. 2Compress the PDF and open it to check readability and page count.
  3. 3If it is still too large, split the PDF or use an accepted transfer method.
  4. 4Confirm failure reason
  5. 5Compress the PDF

Before sending

Platform promptSize, format, or network errorDo not assume only size
ReadabilityStill readable after compressionReview contracts and receipts carefully
PagesSame page count and orderOpen the result
FallbackSplit PDF or use a linkFollow recipient requirements

Exact specifications, file-size limits, dates, and upload rules can change. Always follow the latest official notice or the target platform prompt.

Share this scenario

Card generation is off by default and only uses public page text, brand, URL, and QR code.

Before sending

Item
Requirement
Note
Platform prompt
Size, format, or network error
Do not assume only size
Readability
Still readable after compression
Review contracts and receipts carefully
Pages
Same page count and order
Open the result
Fallback
Split PDF or use a link
Follow recipient requirements

Exact specifications, file-size limits, dates, and upload rules can change. Always follow the latest official notice or the target platform prompt.

Workflow

1

Confirm failure reason

Read the platform prompt.

2

Compress the PDF

Create a smaller PDF version.

3

Review the result

Check clarity, pages, signatures, and images.

4

Send again

Split or use another transfer method if still too large.

FAQ

Do chat and email platforms use the same size limit?

No. Limits vary by platform, client, and account state. Follow the current platform prompt.

Will compression remove content?

It should not remove pages, but always open the result and review it.

Can I compress formal contracts?

You can reduce size, but review clarity, signatures, and recipient requirements and keep the original file.

Related scenarios

How to compress a paper or submission PDF to a target size

When a PDF is too large for a submission platform, check the official limit, compress the file, and review readability before upload.

How to merge multiple images into one PDF

Combine photos, screenshots, or receipts into one PDF, review page order, and compress the result if needed.

How to remove photo location data before posting

Clean EXIF metadata such as GPS, device, and shooting time before posting photos online.

Compress a PDF attachment for chat or email | CatConvert