PDFConverterOnline.com

Free · runs in your browser · nothing is uploaded · works offline

Split a Large File into Parts (and Join Them Back) — No Upload

Email-sized parts out, the exact original back in.

Email-sized parts out, the exact original back in.

      Private by design: processing happens on your device with open-source libraries served from this site (licences). Nothing is uploaded, and once loaded the tool keeps working offline. Need other tools? All tools are on the homepage.

      Free, no ads, no upsell. If it saved you a trip to a paid converter, you can buy the developer a coffee — it funds new tools and keeps this one free. ☕ Buy me a coffee

      Runs on your deviceTested on Pixel 7 & MacBook Air M2Open-source engines · licences

      About this tool

      Pick the part size (5, 10, 25, 50 or 100 MB), press Split: you get .part001, .part002… plus a small manifest with the SHA-256 of the whole file. The recipient drops all the parts into the Join mode and gets the original back, verified against the manifest. No installation on either side.

      Everything is plain byte slicing on your device; no upload, no account.

      How it works

      1. Step 1. Choose the file (Split) or all its parts (Join).
      2. Step 2. Pick a part size.
      3. Step 3. Press Split / Join and download.

      Questions

      Does the recipient need this site?

      They need any tool that can concatenate the parts — this page is the easiest, and it verifies the checksum.

      Are the parts usable on their own?

      No; they are raw slices and only make sense once joined.

      What is the manifest for?

      It records the part list and the original's SHA-256 so a corrupted or missing part is detected.

      Good to know

      • Parts must all be present to join.

      Updated · Part of PDFConverterOnline.com, the independent guide to every PDF converter online.