Compress PDF for Email — Under 25 MB
Gmail and Outlook both reject attachments over 25 MB. This brings a large PDF under the line.
Before you use this: This tool rasterises your PDF — text becomes part of an image and stops being selectable or searchable. For a résumé this matters: applicant tracking systems read the text. If your file is only slightly over the limit, re-export from your word processor at lower image quality instead.
Rendering pages and searching for the best quality that fits…
- Original
- —
- Compressed
- —
- Reduction
- —
- Pages
- —
How to use this tool
- Select your file, drag it onto the box above.
- Processing starts automatically — there is nothing to configure.
- Check the result panel, which shows the original size, the final size and the page count.
- Click Download to save it.
The 25 MB limit applies after encoding, which adds roughly a third to the raw file. A 24 MB file can still be refused — target 18 MB or less to be safe.
The specification
| Gmail limit | 25 MB |
|---|---|
| Outlook limit | 25 MB (20 MB for some Exchange configurations) |
| Safe target | Around 18 MB |
| Alternative | Share a cloud link instead of attaching |
Why uploads get rejected
Meeting the size is only part of it. These are the failures that actually come up:
- The file is just under 25 MB but still refused, because encoding overhead pushes it over.
- The recipient’s mail server enforces a smaller limit than yours.
How it works
Each page is rendered with pdf.js and re-encoded as a JPEG, then the pages are reassembled into a new PDF with pdf-lib. A binary search over image quality — and, if needed, render resolution — lands the result under your target.
The trade-off, stated plainly: this rasterises the document. Text becomes part of an image, so it is no longer selectable, searchable, or readable by automated systems. That is how most "compress to X KB" services work, and it is the only way to hit a hard size target in a browser — but it is a real cost. If you need the text to stay live, use a smaller scan resolution instead of compressing afterwards.
Who uses this
Anyone emailing a scanned contract, portfolio, or report that will not send.
Frequently asked questions
Why is my file too large in the first place?
Almost always an embedded image at print resolution — a headshot, a logo, or a scanned page. Text itself takes very little space; a text-only PDF is usually well under 300 KB.
Will this affect how systems read my document?
Yes, and it matters for résumés specifically. Rasterising removes the text layer, and applicant tracking systems parse that text. If you are close to the limit, re-exporting with lower image quality preserves the text and is the better fix.
Should I keep the original?
Always. Keep a full-quality version for printing and for sending directly to a person, and use the compressed one only where a portal forces it.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device. Your file is never transmitted and never stored by us. You can confirm this by opening your browser’s Network tab while you use the tool — you will see no upload request.
Is there a limit on how many files I can process?
No. There is no daily cap, no account, and no watermark. Because the work happens on your device rather than our servers, there is nothing for us to ration.
Is this tool really free?
Yes — no account, no trial, no watermark, and no cap on usage. It runs on your own device rather than our servers, so there is no cost for us to pass on.
Does it work on mobile?
Yes. The interface adapts to phone and tablet screens, and everything runs in the browser, so there is no app to install.
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Your files stay on your device. This tool runs entirely in your browser. No file is uploaded, transmitted, or stored. You can verify this by opening your browser's Network tab while using the tool.
Disclaimer. Specifications published by exam boards, governments and platforms change without notice. We verify and date every specification on this site, but you should always confirm against the official source before submitting an application. See our full disclaimer.