Tools
All tools
Pick an area, jump straight to a popular tool, or see what shipped recently.
Finance
48 calculators · live metal rates
Metal rates, income tax planner, FD, EMI, SIP and more financial tools
Open FinanceBill Generator
53 Indian formats · live PDF preview
Indian bill & receipt formats with live preview and PDF
Open Bill GeneratorStamp Maker
100 templates · PNG & SVG
Free online stamp & seal maker — PNG, SVG, stamp a PDF
Open Stamp MakerOnline Signature
Draw or type · transparent PNG
Draw or type a free signature PNG — private, no signup
Open Online SignatureImage Tools
70 tools · runs in your browser
Compress, resize, crop, convert and edit images — nothing uploaded
Open Image ToolsPDF Tools
81 tools · runs in your browser
Merge, split, compress, convert and edit PDFs — nothing uploaded
Open PDF ToolsText Tools
34 tools · runs in your browser
Count, clean, convert and compare text — nothing uploaded
Open Text ToolsSecurity Tools
39 tools · runs in your browser
Generate, encode, hash and decode — nothing uploaded
Open Security ToolsUtilities
3 tools · runs in your browser
Random numbers, name picker and QR reader — nothing uploaded
Open UtilitiesData Tools
30 tools · runs in your browser
Format and convert JSON, CSV, Excel and YAML — nothing uploaded
Open Data ToolsCode Tools
13 tools · runs in your browser
Format, minify and test code — nothing uploaded
Open Code ToolsConverters
20 tools · runs in your browser
Convert units, dates, colours and numbers — nothing uploaded
Web Tools
13 tools · runs in your browser
Meta tags, robots, redirects and web helpers
Whistle
Chrome extension · keyboard launcher
Chrome extension — aliases, fuzzy search, pinned hotkeys
Open Whistle
What’s new
Recently added
- Code ToolsCode
HTML, CSS, JavaScript and SQL formatters and minifiers, regex tester and more in your browser
- Security ToolsSecurity
Generate passwords and UUIDs, encode Base64 and URLs, hash and encrypt files in your browser
- Whistle - Bookmark Launcher and ManagerWhistle
Chrome extension with aliases, fuzzy search and pinned hotkeys
Workflows
Tools that work together
Move from one real Nelstack tool to the next — bills, signatures, stamps and calculators in a single flow.
Business document workflow
Create a bill, sign the PDF, design a seal, then stamp the document — all in the browser.
Buying a home
Size the home-loan EMI, see what prepaying saves, check if switching lenders helps — and claim HRA while you rent.
HRA proof workflow
Estimate exemption, generate a rent receipt, and add a signature.