Compress PDF to 25MB for Gmail
Try the Gmail 25 MB preset to reduce your PDF. One file may not reach the target at acceptable quality; if you get several parts, check their sizes and send them separately or use Drive.
Fit-or-split result: get one PDF that fits, or a ZIP of parts under the limit.
Email presets: Gmail 25MB, Outlook 20MB, Outlook.com 25MB, plus custom size.
Private by default: files auto-delete after 60 hours; we don't store document contents in logs.
How it works
Upload
Pick a PDF and a target limit.
Process
We optimize and split as needed.
Share
Download a single file or parts.
Gmail 25MB FAQ
What is Gmail’s attachment limit?
Personal Gmail accounts allow up to 25 MB of attachments in total per message. Work and school limits are set by the administrator. Adding all PDF parts to one message does not bypass the total limit.
What if the PDF still exceeds the target?
Compression can reduce image quality. Splitting may help, but an oversized single page can still exceed the target. Check each PDF after extracting the ZIP; the ZIP itself can be larger than 25 MB.
Plan your Gmail attachments
Gmail’s 25 MB total attachment limit
For personal Gmail accounts, 25 MB is the total size of all attachments in one message, not an allowance for each file. Work or school account limits depend on the administrator.
If the total is over the limit, Gmail adds a Google Drive link instead of an attachment. Check the recipient’s access when sharing a link. See Google’s attachment guidance.
Try compression, then review any parts
PDFThin tries to reduce the PDF toward the chosen target. Image compression may soften small text, stamps or signatures; compare the output with the original before sending. A smaller file is not a guarantee of unchanged quality.
If compression does not meet the target, the tool may split the PDF by pages. An individual page that remains too large can prevent completion at that target. A higher target or a different sharing method may be needed.
Send parts in separate messages or use Drive
If you receive a ZIP, extract it and check each PDF’s size and page order. The size target applies to the PDF parts; the complete ZIP can exceed it.
Keep the combined attachment size within the limit for each message. Send parts in separate messages or share through Drive. Other mail gateways may impose lower limits; a lower target can leave room but cannot guarantee delivery.
Gmail resources
See the Gmail attachment limit guide for details on size caps.
If your PDF is still large, use split by size or follow the make a PDF under 25MB guide.
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