File Tools
A set of browser-based file utilities for generating random or empty files and truncating, slicing, or intentionally corrupting text files for testing. Everything runs locally in your browser, so nothing you paste or generate is ever sent to a server.
Text File Generator
Generate a paragraph of pseudo-random filler text and download it as a .txt file.
Open toolFile Corruptor
Randomly corrupt a percentage of characters in a text file to simulate bit rot or a bad download.
Open toolEmpty File Generator
Download a zero-byte placeholder file with any filename you choose.
Open toolBinary File Generator
Generate a file of cryptographically random bytes and download it as .bin, with a hex preview.
Open toolText File Slicer
Extract an exact byte range from a text file, like dd or tail -c, without splitting characters.
Open toolText File Truncator
Cut a text file down to an exact maximum byte size, without splitting multi-byte characters.
Open toolBase64/Hex File Encoder & Decoder
Encode a real uploaded file to Base64 or hex text, or decode text back into a downloadable file.
Open toolExcel to JSON Converter
Upload a real .xlsx, .xls, or .csv workbook and convert a sheet to JSON.
Open toolExcel to CSV Converter
Upload a real .xlsx or .xls workbook and convert a sheet to CSV.
Open toolCSV to Excel Converter
Paste CSV text and download it as a real .xlsx workbook.
Open toolJSON to Excel Converter
Paste a JSON array of objects and download it as a real .xlsx workbook.
Open tool