Converter — Complete Guide
This page collects the guides for 11 tools in one place. Pick a tool name from the list and its guide opens beside it, so there is no page to navigate to and no account to create.
Base64 Encoder/Decoder
Encode text or files to Base64 (standard or URL-safe) and decode back.
How to use it
- Paste text to encode, or a Base64 string to decode.
- Choose the direction.
- Run the conversion and copy the result.
Use cases
- Putting a small token into a URL query parameter.
- Sending a value inside a JSON field that must stay a string.
- Decoding a string from a log or a header to read it.
Limitation — Handles UTF-8 text and whole files, with standard and URL-safe alphabets; Base64 is encoding, not encryption.
Image Resizer & Converter
Resize, compress, and convert JPG, PNG, and WEBP images in your browser.
How to use it
- Choose a JPG, PNG, or WebP image.
- Set the target format, the dimensions, and the quality slider.
- Process the images and download the results, then check one at full size.
Use cases
- Shrinking a screenshot under an upload limit before posting it.
- Converting a PNG with transparency to WebP for a smaller page weight.
- Converting a photo to JPG when a form only accepts JPG.
Limitation — Converts browser-decodable JPG, PNG, and WebP images; independent dimensions can change the aspect ratio.
SVG to PNG/JPG
Render SVG to PNG or JPG at 1x–4x scale.
How to use it
- Choose an SVG file from your device.
- Set the output width and height in pixels.
- Render and download the PNG.
Use cases
- Getting a fixed-size PNG from a logo or icon before uploading it.
- Producing a raster copy of a diagram that needs to go into a document.
- Checking how an SVG looks at the exact dimensions an upload form demands.
Limitation — Rasterizes SVG to PNG or JPG at 1x–4x scale; SVGs with external URL references are refused with an explanation.
Spreadsheet Converter
Convert XLS, XLSX, ODS, CSV, JSON, and HTML tables in your browser.
How to use it
- Load an XLS, XLSX, ODS, CSV, or HTML table file.
- Pick the sheet you want when the workbook has more than one.
- Export to the target format and open the result to confirm the data landed correctly.
Use cases
- Turning a CSV export from an old system into JSON for an API.
- Opening an ODS file from a colleague who does not use Excel.
- Converting a small table into an HTML snippet for a documentation page.
Limitation — Exports the active sheet for some formats; formulas, styling, and metadata can change after conversion.
Document Converter
Preview and convert DOCX, ODT, TXT, and HTML documents in your browser.
How to use it
- Load a DOCX, ODT, TXT, or HTML file.
- Read the preview to see what the converter actually found inside it.
- Pick the output format and save, keeping the original in case the conversion loses formatting.
Use cases
- Reading an ODT file when only Office is installed on your machine.
- Checking what is actually inside a DOCX before converting it.
- Turning a plain-text export back into a readable HTML page.
Limitation — Supports DOCX, ODT, TXT, and HTML text conversion; rich formatting and metadata are not preserved for every format.
Media Converter
Convert video, audio, and image formats in the browser (100 MB cap).
How to use it
- Choose a video or audio file. Large files take longer because the work happens on your device.
- Select the output format and any codec options.
- Run the conversion and download the result, then play it to confirm it is not corrupted.
Use cases
- Converting a MOV from a phone into MP4 that a site will play.
- Extracting audio from a video for a podcast clip.
- Changing a container without re-encoding when the codec is already supported.
Limitation — Processes one file in a browser-heavy FFmpeg.wasm workflow; large files and codecs may not work reliably.
Markdown/HTML/LaTeX Converter
Convert Markdown, HTML, and LaTeX with Pandoc WASM.
How to use it
- Paste your source text into the input area.
- Choose the source and target formats from the selectors.
- Copy the output and paste it where you need it.
Use cases
- Writing a README in Markdown and checking the rendered HTML.
- Converting a LaTeX citation block to something a web page accepts.
- Turning a LaTeX snippet into HTML for a blog post.
Limitation — Uses pasted text and Pandoc WASM with a limited format selector; it is not an Office or PDF file converter.
Converter to PDF
Render spreadsheet or HTML table data to a PDF in your browser.
How to use it
- Load a spreadsheet file or paste an HTML table.
- Choose the area to render and the page settings.
- Generate the PDF and open it to check the layout before printing.
Use cases
- Sending a clean copy of figures you do not want edited by the recipient.
- Printing a table that has lost its cell borders in a copy-paste.
- Attaching a readable version of a sheet to an email thread.
Limitation — Renders the active sheet as an A4 raster PDF; output text is not selectable and page controls are limited.
Split Files
Split a large file into downloadable chunks in your browser.
How to use it
- Choose the file to split.
- Set the chunk size in megabytes.
- Run the split and download the ZIP of pieces.
Use cases
- Working around an upload size limit on a form or email client.
- Preparing a dataset for transfer over a slow connection.
- Breaking a large log into readable sections before sharing it.
Limitation — Streams file slices that keep the original name and extension, plus a manifest.json for rejoining; the 500 MB cap is per file.
Join Files
Combine multiple files into one ZIP archive in your browser.
How to use it
- Choose two or more files.
- Keep the selection order the way you want it stored.
- Run the join and download the ZIP.
Use cases
- Bundling several assets into one download for a client.
- Grouping output files from a build for archival.
- Preparing a small set of documents to send together.
Limitation — Concatenates parts back into one file in name order; it does not repair missing or out-of-order chunks.
Corrupt File
Create a corrupted copy of a file for testing purposes.
How to use it
- Choose the file you want to damage.
- Set how many bytes to corrupt.
- Run it and download the damaged copy.
Use cases
- Checking that a file parser fails gracefully on bad input.
- Confirming a checksum or integrity check actually detects damage.
- Reproducing a corrupted-upload bug reported by a user.
Limitation — Performs destructive random byte replacement for testing and does not repair the file.
All Loonix tools process your input in the browser: text you type and files you pick never leave your device. Anything downloaded from the internet — say the FFmpeg runtime — is a supporting binary, not your data.
