Convert, compress, calculate, validate and transform supported files entirely in your browser. UsefulUtility downloads the engine; it does not upload the work.
43
ready tools
8
engine groups
0
upload routes
Smart local entry
Static deployment
HTML, JavaScript, workers and WASM only.
Disposable workers
Cancel heavy jobs by terminating the worker.
Local workspace
OPFS files with Dexie history and recipes.
Lazy engine packs
Heavy media and WASM load only when used.
Tool directory
Convert, resize, compress, inspect and package web imagery.
Merge, split, extract, rotate, label and inspect documents.
Create ZIPs, extract safely and handle GZIP streams.
Transform CSV, JSON, YAML, XML and spreadsheet data.
Encoders, checksums, identifiers, QR codes and validators.
Exact unit, percentage, date, ratio and bitrate calculations.
Inspect and convert media with local FFmpeg WebAssembly.
Inspect and convert common tessellated model formats.
Each tool has a versioned manifest, typed options and a local engine. The same packages can be embedded in PicPlayer, PDFPioneer, SumSmith, SceneShaper and other ZenBinary applications.
01
Choose an exact tool
02
Process in a local worker
03
Download or explicitly save
This browser
Capability detection, not browser-name guessing
Checking local capabilities…
Popular starting points
Convert PNG, JPEG and WebP images without uploading them.
Open toolResize one or many images by exact or bounding dimensions.
Open toolReduce image size by quality or search for a target file size.
Open toolCreate common favicon, Apple touch and PWA icon sizes in one ZIP.
Open toolCombine multiple PDFs in the order you choose.
Open toolExport every page as an individual PDF in one ZIP.
Open toolPlace JPEG and PNG images into a PDF in the selected order.
Open toolPackage multiple files into a streaming ZIP archive.
Open toolConvert CSV rows into JSON objects or arrays.
Open tool