Free Private File Converters

Free file converters that run entirely in your browser. No uploads, no accounts, no retention — images, data formats, documents, and media.

Everything runs in your browser

Every converter on this site reads your file into browser memory, transforms it there, and hands the result back as a download. Nothing is transmitted to a server at any point, which you can verify yourself by opening your browser network tab while a conversion runs.

That architecture matters most for the files people most often need to convert. Contracts, medical records, tax documents, identity scans, and proprietary configuration are exactly the material that ordinarily gets uploaded to an unknown third party in exchange for a free conversion. When the work happens locally there is no retention policy to evaluate, no queue of other people documents sitting alongside yours, and no breach surface.

The trade-off is honest: browser memory is the ceiling. Very large video files and multi-gigabyte archives are better handled by a desktop tool, and the pages that are affected by this say so directly.

Fewer pages, written properly

Reciprocal conversions share a page rather than occupying two. CSV to JSON and JSON to CSV are one tool with a direction switch, because the explanation of where the two formats disagree is the same explanation either way. Each page documents what the conversion actually does to your data, including the parts that are lossy, rather than asserting that it simply works.

Data & developer formats

CSV, JSON, YAML, XML: choosing a data format — Every conversion between these formats loses something. Knowing what, in advance, prevents most of the resulting bugs.

• CSV to JSON Converter — CSV and JSON get treated as interchangeable, and for a flat table of strings they nearly are.
• YAML to JSON Converter — YAML is a superset of JSON, so every JSON document is already valid YAML.
• XML to JSON Converter — There is no standard mapping between XML and JSON, which is why two converters can produce different output from the same input and both be defensible.
• INI / .env to JSON Converter — INI files and .env files never had a specification, only conventions that each parser interprets slightly differently.
• Base64 Encoder & Decoder — Base64 exists to move binary data through channels that only reliably carry text, such as email bodies, JSON string fields, and URLs.
• SQL Schema to JSON — A .sql dump describes your schema perfectly well, but it describes it as text.
• SHA-256 File Checksum Generator — A checksum answers one question: is this file byte-for-byte identical to the one the publisher released.

Images & graphics

Choosing an image format — Why the same photograph can be 40 KB or 4 MB depending on a single dropdown, and how to choose deliberately.

• PNG to JPG Converter — PNG stores every pixel exactly and supports transparency.
• JPG to PNG Converter — Converting JPG to PNG gives you a lossless container, not a better image.
• Image Format Converter — Most format conversions are the same canvas operation with a different encoder on the end, which is why they belong on one page rather than fifteen.
• HEIC to JPEG Converter — Apple switched the default iPhone camera format to HEIC in 2017, which is why photos that look fine on your phone refuse to open on a Windows machine or uplo...
• PNG to Favicon (ICO) — The ICO format is a relic of Windows 3.1 that survives because browsers still request /favicon.ico from the site root whether or not you asked them to.
• SVG to PNG Rasterizer — Rasterizing an SVG converts resolution-independent instructions into a fixed grid of pixels.
• SVG Minifier & Optimizer — An SVG exported from Illustrator, Sketch, or Figma is frequently two to five times larger than the same drawing needs to be.
• TTF to WOFF2 Web Font Compressor — WOFF2 is the only web font format worth serving in 2026.
• Image to Base64 Data URL — A data URL embeds an image directly into HTML, CSS, or JSON as text, removing the need for a separate HTTP request.
• Color Palette Extractor — Pulling a palette from a photograph is useful when you are building a theme around an image, matching UI chrome to a hero shot, or checking what a brand asse...

Documents & archives

Working with documents: PDF, DOCX, and spreadsheets — Document formats encode intent as much as content, and conversions between them succeed or fail on whether that intent was recorded.

• Excel to CSV Converter — A spreadsheet is a grid of values plus a large amount of everything else: formulas, formatting, multiple sheets, merged cells, charts.
• ZIP Compressor & Extractor — ZIP has been the default archive format since 1989 because it is simple, universally supported, and stores each file independently so any one of them can be...
• DOCX to HTML Semantic Parser — Word can export HTML on its own, and the result is notorious: thousands of lines of inline styles, conditional comments, and mso- prefixed attributes wrapped...
• PDF Merger — Merging PDFs is the most common reason people upload confidential documents to a random website.
• PDF Page Splitter — Splitting a PDF into separate pages is the counterpart to merging, and it runs into the same structural realities.
• PDF to PNG Pages — Rendering PDF pages as images is what you do when the destination cannot handle PDFs: a slide deck, a web page thumbnail, an image-only upload form.
• Images to PDF Converter — Turning a folder of images into one PDF is the standard way to submit scanned paperwork, since almost every institutional upload form accepts PDF and almost...
• Markdown to HTML Converter — Markdown has no single specification, which is why the same file renders differently on GitHub, in your editor preview, and in a static site generator.

Audio & video

Audio and video: containers, codecs, and transcoding — An MP4 is not a format, it is a box. Knowing what is in the box explains most media conversion behaviour.

• MP4 to MP3 Extractor — Pulling the audio out of a video is normally a server-side job, because it needs a real media pipeline.
• WAV to MP3 Compressor — WAV stores audio as raw uncompressed samples, which is why a three-minute recording runs to about 30 MB.
• Video to GIF Converter — GIF is a 1987 image format that became the internet standard for short looping animation despite being comprehensively bad at it.