estrel Tools

Online Toolbox

Lightning-fast, precise tools with a clean design. Your data stays in your browser — speed and privacy without compromise.

Format and validate JSON with syntax highlighting

Combine multiple PDF files into one, client-side.

View current times in multiple timezones simultaneously

Resize and optimize images easily

Convert images to PDF documents

Decode and inspect JWT tokens safely client-side

Split a PDF into separate pages or ranges, client-side.

Create all favicons & manifest from one image.

Convert timestamps/ISO strings to readable dates

Convert between color formats and explore palettes

Change text between different case formats

Count words, characters, and analyze text

Encode or decode Base64 data

Generate custom QR codes instantly

Encode and decode URLs safely

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