No uploads, no waiting. Everything runs locally, so your files stay with you.
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.
Conversions use your own CPU through WebAssembly and WebCodecs. Closing the tab discards the file from memory.
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.
Output downloads straight to your machine with no watermark, no cap on the result, and no sign-in required.
Four families run locally on this page. Each engine is named so you know exactly what is doing the work.
PNG, JPG, WebP, AVIF, BMP, ICO, and SVG convert with the Canvas API and a WebAssembly AVIF encoder. You can also turn an image into a single-page PDF, or pull text out of one with OCR.
HEIC, TIFF, RAW (CR2, NEF, ARW, DNG), and PSD need the desktop app; the browser cannot decode them.
MP3, WAV, FLAC, AAC, and OGG 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.
M4A, OPUS, WMA, AC3, and AIFF route to the desktop app, where a native FFmpeg build owns the pipeline.
MP4, MKV, MOV, WebM, and TS convert through WebCodecs with hardware acceleration, plus GIF export. Files up to 500 MB. Trim, crop, rotate, resize, and set quality before converting.
AVI, FLV, WMV, 3GP, MPEG, MTS, VOB, and MXF need the desktop app, which ships the muxers the browser lacks.
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.
Jump to a dedicated page for the conversion you need. Each one runs locally with the same privacy guarantees.
Yes. Every conversion on this page is free and needs no account. The paid desktop app adds batch folders, more formats, and no size limit, but the browser tool is not a trial or a teaser.
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.
Video up to 500 MB and audio up to 100 MB. Images and documents are bounded by your device's memory rather than a fixed cap. The desktop app removes the limit and converts files of any size.
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.
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.
