Notes & guides

Most “merge PDF” sites upload your documents to their servers first. Here is how to combine PDFs into one file in your browser, so contracts, statements and IDs never leave your device.

You only have the PDF and need to change the wording. Turn it into an editable Word document in your browser — and know when it will work well and when it won’t.

Phone videos are huge and email and messaging apps have size limits. Make a video smaller in your browser, choose how much quality to trade, and get an MP4 that plays everywhere.

Someone sent you an AutoCAD drawing and you don’t have AutoCAD. Convert it to DXF — the documented format almost every CAD program opens — in your browser, without uploading it.

Slicers print triangle meshes, not CAD solids. Here is how to turn a STEP or STP file into an STL your slicer accepts — and what to check before printing.

iPhones save photos as HEIC, which many Windows programs, websites and upload forms reject. Convert them to JPG in your browser — no app, no upload.

Keep just the sound of a video — a song, a talk or a voice memo — as an MP3 that plays anywhere.

Email attachments are usually capped around 20–25 MB. Here is how to shrink a heavy PDF — and when compression will not help.

Most file tools upload your documents to a server. Xonvert flips that — everything runs in your browser. Here’s why that matters.

A quick, practical guide to choosing the right image format for the web in 2026 — and when to convert.

Convert images, audio, video, and documents privately — no account, no upload, no watermark.