✦ 100 free tools · no signup · browser-private
Free Online Tools
Fast, private tools for developers, designers and everyday tasks. Most run entirely in your browser — no uploads, no account required.
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Popular Tools
most used- Image CompressorCompress JPG, PNG and WebP images online — without uploading them to a server.
- PDF CompressorShrink a PDF for email and upload limits — processed locally, never uploaded.
- JSON Formatter & ValidatorFormat, validate and minify JSON with precise error locations.
- QR Code GeneratorCreate a QR code for any link or text and download it as PNG — free, no signup.
- DNS CheckerLook up A, AAAA, CNAME, MX, NS and TXT records for any domain in one shot.
- Website Health CheckerOne scored report: uptime, SSL, DNS, speed, redirects, security headers, SPF and DMARC.
Image Tools
9 tools- Image CompressorCompress JPG, PNG and WebP images online — without uploading them to a server.
- Image ResizerResize images to exact pixel dimensions in your browser — free and private.
- Compress Image to Target SizeHit an exact file size — compress an image to 100 KB, 50 KB or any target you need.
- WebP ConverterConvert JPG or PNG to WebP — and WebP back to JPG or PNG — in your browser.
- JPG to PNG ConverterConvert JPG images to PNG (and PNG to JPG) instantly in your browser.
- Image to Base64Turn an image into a Base64 data URI for embedding in HTML, CSS or JSON.
- Base64 to ImageDecode a Base64 string or data URI back into a viewable, downloadable image.
- Favicon GeneratorOne logo in — every favicon size out: browser tabs, iOS, Android, plus the HTML snippet.
- Aspect Ratio CalculatorFind any image or video’s ratio and scale it to new dimensions without distortion.
PDF Tools
5 tools- PDF CompressorShrink a PDF for email and upload limits — processed locally, never uploaded.
- Merge PDFCombine multiple PDFs into one file, in the order you choose — privately in your browser.
- JPG to PDF ConverterTurn JPG and PNG images into a single PDF — locally, with no upload.
- Split PDFExtract exactly the pages you need from a PDF — ranges like 1-3, 5, 8- understood.
- Rotate PDFFix sideways or upside-down scans — rotate every page in one click.
Developer Tools
24 tools- JSON Formatter & ValidatorFormat, validate and minify JSON with precise error locations.
- JWT DecoderDecode a JWT’s header and payload instantly — locally, without your token leaving the page.
- Base64 Encoder / DecoderEncode text to Base64 or decode it back — with full Unicode support, locally.
- UUID GeneratorGenerate cryptographically random UUID v4 identifiers — one or hundreds at once.
- Hash GeneratorSHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text — computed locally.
- URL Encoder / DecoderPercent-encode or decode URLs and query parameters — with the component/full distinction done right.
- Unix Timestamp ConverterConvert Unix timestamps to readable dates and back — seconds or milliseconds, auto-detected.
- CSV to JSON ConverterTurn CSV exports into a JSON array of objects — quotes, delimiters and headers handled properly.
- JSON to CSV ConverterFlatten a JSON array of objects into a spreadsheet-ready CSV.
- Regex TesterTest JavaScript regular expressions live — matches, indices and capture groups as you type.
- Text Diff CheckerCompare two texts line by line — additions and deletions highlighted.
- HTTP Status Code LookupEvery HTTP status code explained — searchable, with what each one actually means in practice.
- Markdown PreviewWrite markdown, see rendered HTML live — sanitized and local.
- HTML Entity Encoder / DecoderEscape HTML for safe display, or decode &-style entities back to text.
- JSON MinifierStrip every unnecessary byte from JSON — validated, minified, one click.
- XML FormatterPretty-print or minify XML — with well-formedness validation first.
- YAML to JSON ConverterTurn YAML configs into JSON — indentation quirks resolved by a real parser.
- JSON to YAML ConverterTurn JSON into clean, readable YAML for configs and pipelines.
- SQL FormatterTurn one-line SQL into readable, consistently indented queries — dialect-aware.
- Markdown to HTML ConverterConvert markdown into clean, sanitized HTML source you can paste anywhere.
- JSON DiffCompare two JSONs by meaning — key order and formatting ignored, real changes listed by path.
- URL ParserExplode any URL into protocol, host, path and a decoded query-parameter table.
- IP Subnet CalculatorCIDR in — network, broadcast, mask, host range and usable host count out.
- Number Base ConverterBinary, octal, decimal, hex — one number, all four bases, live.
Text Tools
10 tools- Word CounterCount words, characters, sentences and reading time — live as you type.
- Character CounterLive character count with platform limits — tweets, meta descriptions, SMS and more.
- Case ConverterConvert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case and kebab-case.
- URL Slug GeneratorTurn any title into a clean, SEO-friendly URL slug.
- Remove Duplicate LinesDeduplicate a list in one click — keeps the first occurrence, preserves order.
- Sort LinesSort a list A→Z or Z→A with natural number ordering and optional dedupe.
- Whitespace CleanerStrip messy spacing: trim line edges, collapse double spaces, drop empty lines.
- Reading Time CalculatorHow long your article takes to read — at four real reading speeds.
- Find & ReplaceReplace every occurrence in one pass — plain text or regex, case-sensitive or not.
- Invisible Character DetectorFind the zero-width spaces and hidden Unicode breaking your text — and clean them out.
Generators
7 tools- QR Code GeneratorCreate a QR code for any link or text and download it as PNG — free, no signup.
- Password GeneratorCryptographically random passwords with a real entropy estimate — generated locally.
- Lorem Ipsum GeneratorClassic placeholder text by the paragraph — for mockups that need realistic body copy.
- Random String GeneratorCrypto-random strings in bulk — hex, alphanumeric, digits or Base58.
- .gitignore GeneratorTick your stack — get a combined .gitignore that keeps junk and secrets out of git.
- Robots.txt GeneratorA correct robots.txt in seconds — allow-with-exceptions or block-everything staging mode.
- Cron Expression GeneratorBuild cron schedules from presets — and read any expression back in plain English.
CSS & Design Tools
7 tools- CSS Gradient GeneratorDesign a linear or radial gradient visually — copy the CSS in one click.
- Box Shadow GeneratorDial in the perfect CSS shadow with sliders and a live preview.
- Placeholder Image GeneratorCustom-size placeholder PNGs with your colors and text — drawn locally, no external service.
- Image Color PickerClick anywhere on an image to grab its exact color — HEX, RGB and HSL.
- Color Contrast CheckerWCAG contrast ratio between text and background — with live AA/AAA verdicts.
- HEX ↔ RGB ↔ HSL ConverterAny color in, all three formats out — with a live swatch.
- PX to REM ConverterPixels to rem at any root size — with a cheat-sheet for common values.
SEO Tools
2 toolsSecurity Tools
6 tools- Security Headers CheckerScore any site’s security headers — HSTS, CSP, X-Frame-Options and more, with fixes.
- CSP AnalyzerPaste a Content-Security-Policy — get its directives decoded and its weaknesses flagged.
- Cookie Security CheckerAudit a site’s Set-Cookie flags — Secure, HttpOnly and SameSite, cookie by cookie.
- HSTS CheckerVerify a site’s Strict-Transport-Security header — max-age, subdomains and preload readiness.
- CORS CheckerTest any endpoint’s CORS from a chosen origin — see exactly what the browser sees.
- Password Strength CheckerAn honest strength verdict — entropy plus the human patterns crackers try first.
DNS & Domain Tools
7 tools- DNS CheckerLook up A, AAAA, CNAME, MX, NS and TXT records for any domain in one shot.
- DNS Propagation CheckerSee whether your DNS change has reached Google, Cloudflare, Quad9 and other resolvers worldwide.
- DMARC & SPF CheckerCheck whether your domain’s email is protected by SPF and DMARC — and how strictly.
- IP Lookup (Reverse DNS)Find the PTR hostname behind any public IP address.
- WHOIS LookupWho registered a domain, where, and when it expires — the live registry record.
- DKIM CheckerVerify your DKIM public key is published correctly at its selector.
- Email ValidatorCheck an address’s format and whether its domain can actually receive mail.
Website Tools
7 tools- SSL CheckerCheck any site’s SSL certificate: validity, expiry date, issuer and chain.
- HTTP Header CheckerInspect any URL’s response headers and get a security-header report card.
- Redirect CheckerFollow a URL’s full redirect chain hop by hop — statuses, targets and timing.
- Website Health CheckerOne scored report: uptime, SSL, DNS, speed, redirects, security headers, SPF and DMARC.
- Robots.txt CheckerFetch and lint any site’s robots.txt — catch the Disallow that deindexes you.
- Sitemap CheckerValidate any sitemap.xml live — type, URL count and the errors crawlers would hit.
- Open Graph CheckerSee exactly which social tags a live page ships — and what WhatsApp and LinkedIn will miss.
Calculators & Converters
16 tools- Percentage CalculatorWhat is X% of Y — and X is what % of Y — answered live.
- Percentage Change CalculatorIncrease or decrease between two values, as a percentage — the right formula, live.
- GST Calculator (India)Add or remove GST at any slab — with the CGST/SGST split shown.
- EMI CalculatorMonthly EMI, total interest and total outgo for any loan — the same formula banks use.
- SIP CalculatorProject a monthly SIP’s future value — invested amount vs estimated gains, honestly labeled.
- Compound Interest CalculatorA = P(1+r/n)^nt — maturity value at any compounding frequency, FD-style.
- CAGR CalculatorThe honest annual growth rate between two values — compare investments across different periods.
- Age CalculatorExact age in years, months and days — plus total days and your next birthday.
- Date Difference CalculatorDays between two dates — calendar days, weekdays and full weeks.
- Data Size ConverterBytes to KB, MB, GB, TB — with the decimal vs binary (KiB/MiB) story told straight.
- Bandwidth / Download Time CalculatorHow long a file takes at your connection speed — with the megabits vs megabytes trap defused.
- Temperature ConverterCelsius, Fahrenheit and Kelvin — converted live, with absolute zero respected.
- Length ConverterMillimeters to miles — metric and imperial lengths converted live in one table.
- Weight ConverterGrams, kilograms, pounds, ounces and stone — converted live in one table.
- PPI CalculatorPixel density from resolution and screen size — is that display actually sharp?
- Roman Numeral ConverterNumbers to roman numerals and back — with validation of proper form.
Built for privacy
Whenever possible, your files are processed directly inside your browser and never uploaded to BitsSolved. No uploads. No account required.
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