RunFreeTools

Free file converters

Convert images, audio, video, subtitles and documents between formats. Image, audio and video conversions run entirely in your browser — nothing uploaded; document conversions are processed securely on our server and deleted right after. No watermark, no sign-up. Pick the exact conversion you need below.

128 converters · private by design · works on any device

Image converters

PNG, JPG, WebP and AVIF — keep transparency, cut file size.

PNG to WebPWebP to PNGPNG to JPGJPG to PNGJPG to WebPWebP to JPGPNG to AVIFJPG to AVIFAVIF to PNGAVIF to JPGWebP to AVIFGIF to PNGGIF to JPGBMP to JPGBMP to PNGAVIF to WebPGIF to WebPGIF to AVIFBMP to WebPBMP to AVIF

Vector, icon & scan converters

SVG, ICO and TIFF, plus image ↔ PDF — rasterize logos and bundle scans.

SVG to PNGTIFF to JPGTIFF to PDFJPG to PDFPNG to PDFWebP to PDFPDF to JPGPDF to PNGHEIC to PDFBMP to PDFGIF to PDFSVG to JPGSVG to WebPICO to PNGPNG to ICOJPG to ICOICO to JPGTIFF to PNGTIFF to WebPPNG to TIFF

iPhone photo converters

Turn HEIC/HEIF into formats that open everywhere.

HEIC to JPGHEIC to PNG

Document converters

Word, Excel, PowerPoint, ODF, HTML and text ↔ PDF.

DOCX to PDFPDF to DOCXDOC to PDFODT to PDFXLSX to PDFPPTX to PDFRTF to PDFTXT to PDFHTML to PDFRTF to DOCXDOCX to ODTDOCX to HTMLDOCX to TXTODT to DOCXDOC to DOCXXLS to PDFODS to PDFODP to PDFPPT to PDFCSV to XLSXXLSX to CSV

Ebook converters

EPUB, MOBI, AZW3 and FB2 — for Kindle, Kobo and Apple Books.

EPUB to MOBIMOBI to EPUBEPUB to PDFEPUB to AZW3AZW3 to EPUBPDF to EPUBFB2 to EPUBFB2 to MOBIMOBI to AZW3AZW3 to MOBIEPUB to TXTEPUB to DOCXMOBI to PDFAZW3 to PDFPDF to TXT

Audio converters

MP3, WAV, M4A, OGG and FLAC — for any device or editor.

M4A to MP3WAV to MP3FLAC to MP3OGG to MP3MP3 to WAVMP3 to M4AWAV to FLACAAC to MP3WAV to AACMP3 to AACFLAC to AACM4A to AACMP3 to OpusWAV to OpusOpus to MP3M4A to WAVM4A to FLACM4A to OGGAAC to M4AAAC to WAVWAV to OGGWAV to M4AOGG to WAVFLAC to WAVFLAC to OGGOpus to WAVMP3 to OGG

Video converters

MP4, WebM, MOV and MKV — universal, shareable video.

WebM to MP4MOV to MP4MKV to MP4MP4 to WebMMP4 to MOVAVI to MP4M4V to MP4FLV to MP43GP to MP4TS to MP4MP4 to AVIMKV to AVIMP4 to MKVMKV to WebMMOV to WebMMOV to MKVAVI to MKVAVI to WebMWebM to MOVWebM to MKVMKV to MOV

Subtitle converters

SRT and VTT captions for the web and editors.

SRT to VTTVTT to SRT

How online file conversion works

A file converter rewrites your file from one format into another. For everyday media — PNG, JPG, WebP, MP3, MP4, WAV — RunFreeTools does this right in your browser: the Canvas API redraws images and a WebAssembly build of FFmpeg re-encodes audio and video, so nothing is uploaded. For office documents, ebooks and high-fidelity scans (Word, Excel, PowerPoint, EPUB, MOBI, SVG, TIFF) we use a secure server running LibreOffice, Calibre and ImageMagick, then delete your file right after. Every converter is free, needs no sign-up and adds no watermark.

Not sure which format to pick? Choose PDF to lock a document's layout for sharing or printing, WebP or AVIF to shrink images for a faster website, MP4 (H.264) for video that plays everywhere, MP3 for universally compatible audio, and EPUB or MOBI for e-readers and Kindle.

File converters — frequently asked questions

Are these file converters really free?

Yes. Every converter is free to use with no watermark and no sign-up required.

Do my files get uploaded to a server?

It depends on the conversion. Image, audio, video and subtitle conversions run entirely in your browser — image/subtitle use the Canvas API and audio/video use FFmpeg compiled to WebAssembly, so those files never leave your device. Document, ebook and some vector conversions (Word/Excel/PowerPoint, EPUB/MOBI, SVG/TIFF) need office and ebook engines, so they're processed on our secure server over HTTPS and deleted automatically right after.

How does an online file converter actually work?

For everyday formats the conversion happens in your browser using built-in web technology — the Canvas API redraws images into the new format, and a WebAssembly build of FFmpeg re-encodes audio and video. Heavier office, ebook and scan conversions run on a server with LibreOffice, Calibre and ImageMagick. Either way you just drop a file in, pick the output and download.

Can I convert Word, Excel, PowerPoint and ebooks?

Yes. Convert DOCX, XLSX and PPTX (plus ODF, RTF, TXT and HTML) to PDF and back, turn EPUB into MOBI or AZW3 for Kindle, and rasterize SVG and TIFF. These run on our secure server and your file is deleted immediately after conversion.

Will converting reduce the quality?

It depends on the target format. Lossless outputs like PNG, WAV and FLAC keep every detail; lossy outputs like JPG, MP3 and WebP trade a little quality for a much smaller file. We use sensible high-quality settings so the difference is hard to notice.

Is there a file size or batch limit?

There's no account-based limit. Image conversions support batch upload and zip download; in-browser audio and video are limited only by your device's memory, and server-side document conversions accept files up to 100 MB.

Which image format should I convert to?

For the web, WebP is the best all-round choice (small, with transparency). AVIF is even smaller for performance-critical pages. Use PNG when you need lossless quality and JPG for maximum compatibility with photos.