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Home / Compress PDF for Email

Compress PDF for Email Attachment Limits

Choose Gmail 25MB, Outlook 20MB, Outlook.com 25MB, or set any size. PDFThin optimizes first (no visible changes when possible). If it still won't fit, we split your PDF into attachment-ready parts automatically.

How it works FAQ
No signup - Auto-delete in 60 hours - One-time download links

1) Upload PDF

or click to browse your file

Drop your PDF here or click to browse your file
No file selected
Email presets
Gmail 25MB Outlook 20MB Outlook.com 25MB Custom

2) Choose email limit

Tip: some mail systems add Base64/MIME overhead. If 25 MB fails, try 18-20 MB.

3) Advanced (optional)

Advanced (optional)

Most users don't need this.

Compression quality

PNG or JPG up to 2MB. Applied to all pages.

Target: Gmail 25MB Max 200MB
Auto-delete in 60 hours No signup Works without JavaScript
Privacy

4) Download

Ready
Download

    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.

    FAQ

    What is Gmail's attachment limit?

    Gmail supports up to 25 MB of attachments per email. If it's larger, Gmail sends a Google Drive link instead. See compress PDF to 25MB.

    Why does a 24 MB PDF sometimes fail to send?

    Some mail systems encode attachments (Base64/MIME), which can increase message size. If you hit errors, set a slightly lower custom target (e.g., 18-20 MB) or split by size.

    What's Outlook's attachment limit?

    Outlook often has a 20 MB limit for internet email accounts. Outlook.com supports 25 MB for file attachments. Use the 20 MB preset if you run into send errors.

    Will quality degrade?

    Lossless optimization keeps visual quality. Quality mode trades size for fidelity.

    Can I choose a custom limit?

    Yes, set a custom MB limit.

    Send PDFs that fit email limits

    Made for Gmail, Outlook, and Outlook.com

    Choose preset limits and get a file that is ready to attach without retries.

    Quality or size, you decide

    Pick a size target or switch to quality mode when image clarity matters most.

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