Compress PDF to 1 MB for Email
Bring a large PDF under 1 MB so it attaches and sends without bouncing.
Files are optimized losslessly when possible. To guarantee an exact size, larger files are converted to images, which can soften text and remove the selectable text layer.
Compressing PDFs for email attachments
Many mail servers and webmail clients slow down or reject large attachments, so keeping a PDF under 1 MB helps it send and arrive reliably. It also keeps your message light for recipients on mobile data.
KiloPDF compresses the file on your device, so a contract, invoice, or resume never passes through an outside server on the way to your inbox.
Drop in your PDF, keep the 1 MB target, and download. If it is already under 1 MB we keep the original quality.
Need the general tool? Compress PDF to 1 MB for any purpose.
How it works
- Step 1
Drop in your PDF. It stays on your device.
- Step 2
Pick a target size (or type a custom KB value).
- Step 3
Download a PDF compressed to your target in seconds.
Why compress a PDF to 1 MB?
- Resumes and cover letters that must stay small
- Invoices and reports for clients
- Scanned documents shared over email or chat
Compress to another size
Frequently asked questions
Is 1 MB the right size for email attachments?
1 MB is a commonly requested target, but limits vary and change over time. Check the exact requirement on the relevant portal or provider before you upload or send.
Are my files uploaded to a server?
No. Compression runs entirely in your browser using WebAssembly. Your PDF never leaves your device, which makes this safe for KYC, banking, and government documents.
How do you hit exactly 1024 KB?
We re-encode each page as an image and search across quality and resolution settings until the rebuilt PDF lands at or just under 1024 KB, keeping the best quality that still fits.
Is it really free with no watermark?
Yes. No sign-in, no per-hour task caps, no watermark, and no file-count limits, unlike most incumbents.
Will the text stay selectable?
When the file already fits or can be optimized losslessly, text stays sharp and selectable. To guarantee a smaller exact size we rasterize the pages, which is exactly what portal uploads need. If you need selectable text, keep your original.