Developer tools for focused work
Fast, privacy-conscious browser tools by Florian Cullmann — each built to finish one job without getting in the way.
Featured tools
The most-used utilities, ordered by real usage.
PDF Tools
Work with PDF files directly in your browser, without uploads.
PDF MergeCombine multiple PDF files in your chosen order.PDF SplitSplit one PDF into clearly defined page ranges.Compress PDFReduce PDF file size while keeping the best possible quality.PDF to JPGExtract embedded images or convert every PDF page to JPG.JPG to PDFConvert images to PDF and adjust orientation and margins.
Office Tools
Convert Office files directly in your browser, without uploads.
All tools
17 Tools
PDF MergeCombine multiple PDF files in your chosen order.PDF SplitSplit one PDF into clearly defined page ranges.Compress PDFReduce PDF file size while keeping the best possible quality.Excel to CSVExport any worksheet as a clean CSV file.JSON FormatterFormat, validate, and inspect JSON.Base64 EncoderEncode and decode Base64 text.PDF to JPGExtract embedded images or convert every PDF page to JPG.Word to PDFConvert DOC and DOCX files into easy-to-share PDFs.JPG to PDFConvert images to PDF and adjust orientation and margins.UUID GeneratorGenerate secure UUID v4 values.URL EncoderEncode and decode URL components.SHA-256 GeneratorCreate a SHA-256 hash from text.Timestamp ConverterConvert dates and Unix timestamps.Case ConverterTransform text casing instantly.Color ConverterConvert HEX colors to RGB.Word CounterCount words, characters, and lines.Slug GeneratorTurn text into a clean URL slug.
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Practical notes on software and developer experience.