Frequently asked questions

No. Everything here — converting images, audio, video, documents and data, encrypting files, scrubbing metadata, writing documents and spreadsheets, generating QR codes — runs entirely in your browser, using APIs already built into it. Your files never touch a server, so there is nothing to leak, log, or store. The one exception is deliberate and opt-in: if you sign in and choose to save a document or spreadsheet to your account, that copy is stored on our server so it can sync across your devices. Nothing else is.

Turn your network off after the page has loaded, then convert a file. It still works — which it could not do if the file were being sent anywhere. You can also open your browser's developer tools, watch the Network tab while you convert, and see that no request carries your file. How the in-browser tools work explains what your browser is actually doing at each step, and why it can do it without a server.

Images: drop any file — anything your browser can decode — out to PNG, JPEG, WebP, GIF, BMP, TIFF, ICO, TGA, PPM or QOI (AVIF where your browser can encode it). Audio: any audio file and the audio track of MP4, MOV, MKV or WebM video, out to WAV (8/16/24-bit or 32-bit float), FLAC, Opus, AIFF or AU. PDF & docs: combine images into a PDF, and turn text, Markdown or Word .docx files into a PDF or into Markdown. Data & sheets: convert between CSV, TSV, JSON, NDJSON, XML and Excel .xlsx, plus YAML, Markdown tables, HTML tables and SQL. Archives: create and open .zip files, and gzip or gunzip a file. Subtitles: SRT and VTT, both directions. Video: any video your browser can play, out to WebM (VP9/VP8), MP4 (H.264) or an animated GIF. HEIC, RAW camera formats and legacy .doc/.xls aren't supported — no browser can decode those without a large external library. The formats page has the full matrix.

Yes — set the output quality and an optional maximum width or height, and the converter applies them as it converts.

Yes — drop in any audio file your browser can decode (MP3, M4A/AAC, OGG, FLAC, WAV, and more) and it's converted to a standard WAV file locally, with optional mono downmixing and resampling.

Yes — on the Convert page, switch to the PDF & docs section to combine one or more images into a single PDF, one image per page, built entirely in your browser.

Yes. On the Convert page, PDF & docs turns a Word .docx into a PDF or into Markdown/plain text, and Data & sheets converts an Excel .xlsx into CSV, JSON and other formats — or builds an .xlsx from your CSV or JSON. Both formats are really ZIP archives of XML, which your browser can already read and write, so the whole conversion happens on your device. Legacy .doc and .xls files use an older binary format and aren't supported.

Yes — the Archives section bundles any set of files into a .zip, opens an existing ZIP so you can pull individual files back out, and gzips or gunzips a single file. It uses the compression built into your browser, so nothing is uploaded and there is no library to download. Password-protected ZIPs and archives over 4 GB aren't supported.

Yes — the Subtitles section converts SubRip .srt to WebVTT .vtt and back. The direction is detected from the file, cues are renumbered, and timestamps are rewritten for the target format.

Yes. Drop an .mp4, .mov, .mkv or .webm straight into the Audio section and it converts like any other file — your browser's audio decoder reads the audio track directly out of the video container. You can save it as WAV, FLAC, Opus, AIFF or AU. The video itself is never uploaded, and video-to-video conversion still isn't supported.

Try it. There is no file-type filter anywhere in the converter — every file you drop is queued and given a real conversion attempt, whatever its extension or reported type. If it genuinely can't be handled you get a plain message explaining why, rather than the file quietly disappearing from the list.

Because no browser exposes an MP3 encoder, and adding one would mean downloading a large codec library onto your device — which would undercut the point of a converter that runs entirely locally. FLAC gives you lossless audio at roughly half the size of WAV, and Opus is smaller than MP3 at the same quality. MP3 files work fine as input.

Yes. The Video section re-encodes any video your browser can play — MP4, MOV, MKV, WebM and more — to WebM (VP9 or VP8), MP4 (H.264) or an animated GIF, with quality, resolution and audio controls. It uses the encoders already built into your browser, so the video is never uploaded and there is no multi-megabyte codec to download first. Trimming and cropping aren't supported — it converts whole files.

Because it plays the clip through once, and that is the only way to keep every frame. Running the file faster doesn't make the browser work harder — it makes it skip frames. On a ten-second test clip we kept all 300 frames at normal speed but only 151 at quadruple speed. Rather than quietly throwing away half your frames to look quick, it runs at normal speed and lets you control quality with the bitrate and resolution settings. Keep the tab visible while it works.

Yes — that's what the Metadata tab is for. Scan a photo to see exactly what it carries (GPS coordinates, camera make and model, serial number, software, timestamps) and then remove it. The removal is lossless: the metadata is cut out of the file and the compressed image data is copied across untouched, so the picture is bit-for-bit identical rather than re-compressed the way an image editor would. Works on JPEG, PNG and WebP, and like everything else here it happens on your device — the data you're trying to hide is never uploaded.

Yes. That happens when a file was saved in an older character encoding and something later assumed it was UTF-8. Drop it into the Text tab, pick the encoding it was actually saved in — Windows-1252, Shift_JIS, GB18030, Big5, EUC-KR, KOI8-R, UTF-16 and many more — and you get clean UTF-8 back, with your choice of Windows, Unix or classic Mac line endings. Automatic detection handles the common cases.

Yes. The PDF & docs tab reads Word .docx, PowerPoint .pptx, OpenDocument .odt and .ods, .epub ebooks, .pdf files and HTML pages, and writes any of them back out as Markdown, plain text, Word, EPUB or HTML. The format is worked out from the file's own bytes, so it still works if the extension is missing or wrong.

Yes — drop a PDF into the PDF & docs tab and choose Markdown or plain text. It reads the text directly out of the file, with no library to download. The one thing text extraction can't do is a scanned PDF: those are photographs of pages with no text in them at all, and recovering that needs optical character recognition, which isn't offered here. Converting a PDF back into an editable Word file isn't supported either — that's document reconstruction rather than format conversion.

Yes — the PDF & docs tab renders every page as a JPG, PNG or WebP at 72, 150 or 300 dpi, and hands multi-page documents back as a single ZIP as well. Your PDF is never uploaded. This is the one tool on the site that needs a downloaded component (Mozilla's pdf.js, because faithfully drawing a PDF has no browser API), and it is fetched only when you actually use this tool — never on page load, and never for the other converters. It is served from this site rather than a CDN so no third party learns you opened a PDF.

Yes — the Encrypt tab links to a separate tool that encrypts files of any size entirely in your browser, plus an optional one-time burn-after-read link for sharing a secret. Encryption itself never leaves your device; if you use the share link, only encrypted ciphertext is stored on the server, and the decryption key travels in the link itself, never the server.

Yes — the Documents tab opens a private rich-text editor. Write, format and export documents right in your browser for free; saving to your domainless account (for cloud copies and share links) is the only optional paid feature.

Yes — the QR code tab builds a code for a link, Wi-Fi network, contact card, email, SMS, phone number or location. It is free, needs no account, adds no watermark and has no limit on how many you make. Like the rest of the file tools it runs entirely in your browser, and your data is encoded into the code itself rather than pointing at a tracking redirect — so nothing is logged, and the code keeps working even if this site does not. Download it as a PNG or a scalable SVG.

Yes — the Sheets tab opens a spreadsheet editor that runs entirely in your browser. It understands formulas (=SUM(A1:A10), =IF(...), lookups, text and date functions), cell formatting, sorting, and CSV/TSV import and export. It is free and needs no account; your data stays on your device unless you choose to save a copy to your domainless account, which is the only optional paid part and is what makes share links possible.

No account is needed for any of it. Converting, encrypting, scrubbing metadata, making QR codes, and writing documents and spreadsheets are all free and work signed out — a document or spreadsheet you start without signing in is kept in that browser, and you can export it whenever you like. The only paid feature is saving documents and spreadsheets to your domainless account, which is what lets them sync across your devices and what makes share links possible. One subscription covers both Documents and Sheets — they are the same service behind the scenes, so subscribing once covers both, and signing in on one signs you in on the other.

A saved document or spreadsheet can be given a link that others open without an account, either read-only or editable. The link contains a random token, is not listed or indexed anywhere, and you can revoke it at any time from the Share button — after which the old link stops working immediately. Share links are the one part of these tools that necessarily involves our server, since something has to hold the copy the other person opens.