Images
PNG, JPG, WebP, AVIF, BMP, ICO, and SVG convert with the Canvas API and a WebAssembly AVIF encoder. OCR and image-to-PDF are included.
HEIC, TIFF, RAW (CR2, NEF, ARW, DNG), and PSD need the desktop app. Browsers cannot decode them.
Conversion Successful
Convert Any File Securely
No uploads, no waiting. Everything runs locally, so your files stay with you.
Convert files without uploading them
TeraConvert is a local-first converter. When you drop a file it is decoded and re-encoded inside this browser tab using the APIs your browser already ships: the Canvas API and WebCodecs for images and video, and WebAssembly builds of standard codecs for audio and documents. The file bytes are never sent to a server, so there is no upload wait, no queue, and no copy left in the cloud to delete afterward.
Runs in the tab
Conversions use your own CPU through WebAssembly and WebCodecs. Closing the tab discards the file from memory.
Honest about limits
Video up to 500 MB and audio up to 100 MB convert here. Larger files, and formats the browser cannot decode, open in the desktop app.
No watermark, ever
Output downloads straight to your machine with no watermark and no cap on the result.
What you can convert in your browser
Four families run locally on this page. Each engine is named so you know exactly what is doing the work.
Audio
MP3, WAV, FLAC, AAC, OGG, and M4A re-encode in the tab, with optional trim, fade, and volume. Files up to 100 MB; uncompressed WAV and FLAC saturate the browser's memory before larger files finish.
Opus, WMA, AC3, and AIFF need the desktop app's native FFmpeg.
Video
MP4, MKV, MOV, WebM, TS, and AVI inputs convert through WebCodecs or FFmpeg, plus GIF export. Files up to 500 MB. Trim, crop, rotate, resize, and set quality before converting.
FLV, WMV, 3GP, MPEG, MTS, VOB, and MXF need the desktop app. It ships the muxers the browser lacks.
Documents
PDF, DOCX, Markdown, HTML, and TXT convert with pdf-lib, pdf.js, and mammoth, and CSV and TSV are first-class. Reorder PDF pages, split, compress, or edit metadata in the same tab.
ODT, RTF, TEX, XLSX, PPTX, EPUB, and high-fidelity Office output use the desktop app's Pandoc, LibreOffice, and Calibre engines.
Popular conversions
Jump to a dedicated page for the conversion you need. Each one runs locally with the same privacy guarantees.
Questions about the converter
How does pricing work?
Your first conversion is free with no account. After that, converting needs a TeraConvert account and a one-time Pro purchase, backed by a 14-day money-back guarantee. Every conversion still runs in this browser tab, so your files never leave your device.
Are my files uploaded anywhere?
No. The file is read and written inside this browser tab. Nothing is sent to a server, there is no upload progress bar, and closing the tab discards the file from memory. We never see its contents.
What is the largest file I can convert here?
Video up to 500 MB, PDFs up to 100 MB, audio up to 100 MB, images and DOCX up to 25 MB, other documents 10 MB. The desktop app has no size cap at all.
Which file types are supported?
Common image, audio, video, and document formats run in the browser. Formats the browser cannot decode, such as HEIC, RAW, EPUB, and Office spreadsheets, open in the desktop app. The Formats page lists every pair.
Does it work offline?
The conversion runs on your own CPU, not a server, but the page and its codecs load over the network first. For true offline use, the desktop app converts without any connection after one-time activation.