Tivra — Less busywork. More done.

Calculate, convert and work with files. Free tools, no account required.

Tivra brings practical tools for calculations, dates, text, developer tasks, images, PDFs, QR codes and reference data together in one searchable catalog. Open a tool to see its inputs, example values and limits before you run it.

Most everyday tools work in your browser. File uploads and external data requests are shown separately and require your action. Favorites, history and saved results stay in this browser until you clear them.

All categories

Browse by task. Each category page lists the tools in it and explains what they do.

• Calculate — Percentages, dates, statistics, ratios and other everyday calculations. The tool page shows the formula or the limits that matter for the result.
• Convert — Convert units, formats and common values. Check the selected units and assumptions before using a converted value.
• Date & time — Compare dates, count calendar or business days, and work with time zones. Results depend on the selected date and zone.
• Text — Count, clean, compare, sort and transform text. Local text tools do not publish the input as a page.
• Developer — Inspect and format URLs, code, network data and structured text. Network tools identify when a request uses an external provider.
• Data — Look up reference tables and provider data. Each result identifies its source and, when available, its update time.
• Geo — Work with coordinates and geographic formats. Confirm the input coordinate system and precision before reusing a result.
• Images — Resize, convert, inspect and compress images. The image workshop processes files locally; format support and metadata behavior depend on the operation.
• PDF & OCR — Merge, split, inspect and transform PDF files, or recognize text with OCR. Review signature, encryption and size limits before processing.
• QR codes — Create or read QR codes and supported barcodes. Check the decoded destination or content before sharing a code.
• Code and APIs — Check source code, configuration files and API formats. Each tool states which rules it checks and whether it sends a network request; a local check does not run or deploy your code.
• Learning — Explore the teaching language tool with your own input and the examples on its page. Review the supported syntax and limits before interpreting a result.
• Environment — Explore daylight and water models with the values you supply. These estimates are not live measurements or a substitute for a site survey.
• Media and audio — Inspect animation, MIDI, MusicXML and font files, synthesise sound effects and create image maps or sprite sheets. Each tool lists its accepted format and output.
• Planning — Build a conference programme, calculate component requirements or review a team leave calendar from your own data. These tools do not book events, buy stock or apply an official employment policy.
• Security checks — Check a Merkle inclusion proof, scan for signatures you supply and review repository practices from supplied files. These bounded checks do not establish that a file or repository is safe.