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Stax Tools — browser-based developer, finance and PDF tools
100% Client-side
🔒 No signup required
JSON FormatterPDF CompressorBase64 EncoderRegex TesterUUID GeneratorHash GeneratorJWT DecoderURL EncoderColor PickerDiff CheckerMarkdown EditorSQL FormatterImage ResizerQR Code GeneratorTimestamp ConverterPassword GeneratorCSS Gradient GeneratorFavicon GeneratorJSON FormatterPDF CompressorBase64 EncoderRegex TesterUUID GeneratorHash GeneratorJWT DecoderURL EncoderColor PickerDiff CheckerMarkdown EditorSQL FormatterImage ResizerQR Code GeneratorTimestamp ConverterPassword GeneratorCSS Gradient GeneratorFavicon Generator
EMI CalculatorSIP CalculatorBMI CalculatorIP Subnet CalculatorLorem Ipsum GeneratorText Case ConverterWord CounterInvoice GeneratorGST CalculatorImage CompressorBarcode GeneratorPPF CalculatorXIRR CalculatorPDF MergerPDF SplitterCron Expression BuilderRegex Cheat SheetEMI CalculatorSIP CalculatorBMI CalculatorIP Subnet CalculatorLorem Ipsum GeneratorText Case ConverterWord CounterInvoice GeneratorGST CalculatorImage CompressorBarcode GeneratorPPF CalculatorXIRR CalculatorPDF MergerPDF SplitterCron Expression BuilderRegex Cheat Sheet

How it works

Every Stax tool follows the same pattern — open, use, done.

01
Pick a tool

Pick a tool

Browse 235+ free tools by category or search by name. No account, no paywall.

02
Works in your browser

Works in your browser

Every tool runs 100% client-side. Your files and data never leave your device.

03
Done instantly

Done instantly

Results in seconds. Copy, download, or share — no waiting, no email, no limits.

Why Stax?

Built for speed, privacy, and everyone — no exceptions.

🔒

Privacy by design

Tool logic runs in your browser. Your files, data, and inputs never reach our servers.

Files stay on your device
Zero server uploads
Verifiable via DevTools → Network
⚡

Instant results

No server round-trip. Processing happens locally — output is immediate.

~0ms latency
🌍

7 languages

Every tool page localized in EN, HI, ES, FR, AR, JA, and TH.

ENHIESFRARJATH
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Works everywhere

Fully responsive on desktop, tablet, and mobile. No app install required.

No app install needed
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235+ tools, one place

Developer, finance, PDF, image, health, engineering — stop Googling a new tool for every task.

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Developer Tools

69 tools

JSON, regex, encoding, hashing, color, CSS, and more

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From the Blog

Tips, guides and updates from the Stax team.

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Mobile Screen Sizes in Pixels: What Designers and Developers Actually Need to Know
mobilecss

Mobile Screen Sizes in Pixels: What Designers and Developers Actually Need to Know

Standard phone dimensions, iPhone and Android widths, device pixel ratio, and the CSS breakpoints that matter in 2026 — answered question by question.

·6 min read
How to Compress a Video Without Uploading It Anywhere (2026 Guide)
videoprivacy

How to Compress a Video Without Uploading It Anywhere (2026 Guide)

Shrink a video by 50–80% for WhatsApp, email, or the web — entirely in your browser, with nothing uploaded. Step-by-step guide with presets explained.

·6 min read
Diff Checker: What It Is, How It Works, and 6 Use Cases Beyond Code Review
developer-toolsdiff

Diff Checker: What It Is, How It Works, and 6 Use Cases Beyond Code Review

A side-by-side comparison of diff algorithms, how unified and split diff formats work, why character-level diffs matter for text editing, and practical use cases for diff checkers outside of version control.

·6 min read
EPF vs NPS vs PPF: The Three-Way Retirement Comparison for Salaried Indians
epfnps

EPF vs NPS vs PPF: The Three-Way Retirement Comparison for Salaried Indians

Step-by-step comparison of EPF, NPS, and PPF — contributions, interest rates, lock-in, withdrawal rules, tax treatment at maturity, and how to combine all three for a robust retirement plan.

·6 min read

Frequently Asked Questions

Everything you need to know about Stax Tools.

Yes. Every tool on Stax is completely free to use with no hidden fees, trials, or paywalls. There is no premium tier — all features are available to everyone.

No account or sign-up is required. Just open any tool and start using it immediately. Stax is designed to be friction-free.

Yes. All processing happens entirely in your browser using JavaScript — your files, text, and inputs are never uploaded to any server. Stax does not log or store your input data.

Stax Tools works in all modern browsers including Chrome, Firefox, Safari, Edge, and Brave. No plugins or extensions are required.

Yes. All Stax Tools are fully responsive and work on smartphones and tablets. Most tools are optimized for touch input as well as desktop.

Stax covers developer tools (JSON formatter, regex tester, base64 encoder), PDF tools (compressor, merger, splitter), image tools (resizer, converter, color picker), finance calculators (EMI, SIP, BMI), text & writing tools, engineering calculators, and more.

Stax Tools is available in 7 languages: English, Hindi, Spanish, French, Arabic, Japanese, and Thai. Each tool page includes localized FAQ and SEO content.

New tools are added regularly. You can follow updates via the blog at stax.tools/blog or subscribe to the RSS feed at stax.tools/feed.xml.