Simple tools. No brain required.
104 free tools for developers, PDFs, images, text and everyday math. No signup, no uploads — your files are processed right in your browser.
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Popular tools
JSON Formatter & ValidatorPretty-print, validate and minify JSON with exact error positions.
Merge PDFCombine several PDFs into one file, in the order you choose.
Image CompressorShrink JPG, PNG and WebP images with a quality slider and preview.
Remove Background from ImageCut out people and objects with on-device AI — no upload.
Unix Timestamp ConverterConvert epoch seconds or milliseconds to dates, and dates to epoch.
JWT DecoderDecode a JSON Web Token’s header and payload and check its expiry.
Compress PDFShrink large scanned or image-heavy PDFs to email-friendly sizes.
Percentage CalculatorX% of Y, what percent, percentage change and increase/decrease.
Developer Tools All 35 →
JSON Formatter & ValidatorPretty-print, validate and minify JSON with exact error positions.
Regex TesterTest JavaScript regular expressions with live highlighting and groups.
Base64 Encode & DecodeConvert text to Base64 and back, with full UTF-8 and URL-safe support.
JWT DecoderDecode a JSON Web Token’s header and payload and check its expiry.
Unix Timestamp ConverterConvert epoch seconds or milliseconds to dates, and dates to epoch.
UUID GeneratorGenerate random UUID v4 or time-ordered v7 identifiers in bulk.
Cron Expression ParserExplain a cron schedule in plain English and list the next run times.
Hash Generator (MD5, SHA-256)MD5, SHA-1, SHA-256, SHA-384 and SHA-512 for text or files.
URL Encoder & DecoderPercent-encode or decode URLs and query string values.
URL Parser & Query String EditorSplit a URL into parts and edit its query parameters.
HTML Entity Encoder & DecoderEscape <, >, & and quotes for HTML, or decode entities to text.
CSV ⇄ JSON ConverterTurn CSV into JSON arrays or JSON back into CSV, with proper quoting.
JSON ⇄ YAML ConverterConvert JSON to YAML and YAML to JSON for configs and manifests.
Number Base ConverterConvert between binary, octal, decimal and hexadecimal, any size.
Color Converter (HEX, RGB, HSL)Convert colors between HEX, RGB and HSL and check text contrast.
Password GeneratorCreate strong random passwords or passphrases with a strength meter.
QR Code GeneratorMake QR codes for links, text or Wi-Fi and download PNG or SVG.
Markdown Preview & to HTMLWrite Markdown with a live preview and export clean HTML.
SQL FormatterBeautify messy SQL queries with dialect-aware indentation.
XML Formatter & ValidatorPretty-print, validate and minify XML with error locations.
HTML Formatter & MinifierBeautify messy HTML or minify it, with inline CSS and JS formatted too.
CSS Formatter & MinifierBeautify CSS with one rule per line, or minify it for production.
JavaScript FormatterBeautify minified or messy JavaScript and JSON-like code.
JSON to TypeScriptGenerate TypeScript interfaces from a sample JSON object.
JWT Encoder (HS256 Signer)Create and sign JSON Web Tokens with HS256, HS384 or HS512.
HMAC GeneratorCompute HMAC-SHA256, SHA-1, SHA-384 or SHA-512 signatures in hex or Base64.
Chmod CalculatorConvert Linux file permissions between rwx checkboxes, octal and symbolic.
IP Subnet CalculatorCIDR to netmask, network, broadcast, host range and host count (IPv4).
XML to JSON ConverterConvert XML to JSON and JSON back to XML, with attributes kept.
HTML to Markdown ConverterTurn HTML or rich text into clean Markdown.
Markdown Table GeneratorBuild Markdown tables from a grid or pasted spreadsheet cells.
JSON String Escape & UnescapeEscape text for a JSON string, or unescape \n, \" and \u sequences.
HTTP Status CodesSearchable list of HTTP status codes with plain-English meanings.
CSS Gradient GeneratorDesign linear and radial CSS gradients visually and copy the code.
Color Contrast CheckerCheck WCAG 2.2 AA and AAA contrast ratios for text and UI colors.
Text Tools All 15 →
Word & Character CounterCount words, characters, sentences and reading time as you type.
Case ConverterUPPER, lower, Title, Sentence, camelCase, snake_case and more.
Text Diff CheckerCompare two texts and highlight added, removed and changed lines.
Lorem Ipsum GeneratorGenerate placeholder paragraphs, sentences or words for mockups.
URL Slug GeneratorTurn titles into clean, SEO-friendly URL slugs.
Remove Duplicate LinesDelete repeated lines from a list, keeping the first occurrence.
Sort Lines AlphabeticallySort lines A–Z, Z–A, naturally, by length, or shuffle them.
Find and Replace TextReplace words or patterns in text, with case, whole-word and regex options.
Remove Line Breaks & Extra SpacesJoin broken lines, strip extra spaces and clean text pasted from PDFs.
List to Comma Separated ValuesTurn a column of items into a comma-separated list, and back.
Readability CheckerFlesch reading ease, grade level and long-sentence warnings for English.
Random Name Picker & List RandomizerShuffle a list, pick random winners or split names into teams.
Fancy Text GeneratorTurn text into bold, italic, script, bubble and other Unicode styles.
Morse Code TranslatorTranslate text to Morse code and back, with audio playback.
Text to Binary, Hex & ASCII ConverterConvert text to binary, hex, octal or decimal bytes (UTF-8) and back.
PDF Tools All 13 →
Merge PDFCombine several PDFs into one file, in the order you choose.
Split PDFExtract page ranges or split every page into its own PDF.
Compress PDFShrink large scanned or image-heavy PDFs to email-friendly sizes.
PDF to JPG / PNGConvert PDF pages into high-quality JPG or PNG images.
JPG to PDF (Images to PDF)Turn JPG, PNG or WebP images into a single PDF document.
Rotate PDFRotate all or selected PDF pages by 90°, 180° or 270° permanently.
Delete PDF PagesRemove unwanted pages from a PDF and download the rest.
PDF to TextExtract the text from a PDF, page by page, and copy or download it.
Add Page Numbers to PDFStamp page numbers on a PDF, with position, format and start number.
Watermark PDFAdd a text watermark such as CONFIDENTIAL or DRAFT to every page.
Organize PDF PagesReorder, rotate, delete and add blank pages with visual thumbnails.
Sign PDFDraw or type your signature and place it on any page of a PDF.
Edit PDF MetadataView and change a PDF’s title, author, subject, keywords and dates.
Image Tools All 16 →
Image CompressorShrink JPG, PNG and WebP images with a quality slider and preview.
Image ResizerResize images to exact pixels or a percentage, keeping proportions.
Image Converter (JPG, PNG, WebP, HEIC)Convert between JPG, PNG and WebP, including iPhone HEIC photos.
Remove Background from ImageCut out people and objects with on-device AI — no upload.
Crop ImageCrop photos freely or to 1:1, 4:3, 16:9 and other ratios.
Rotate & Flip ImageRotate images 90° or any angle and mirror them horizontally or vertically.
Image to Base64Convert images to Base64 data URLs for CSS, HTML or JSON.
HEIC to JPG ConverterConvert iPhone HEIC/HEIF photos to JPG or PNG, in batches.
SVG to PNG ConverterRender SVG files to crisp PNG at any size or scale, with transparency.
Image Color PickerPick exact colors from any image and get HEX, RGB and HSL, plus a palette.
Watermark ImageAdd a text or tiled watermark to photos, in batches.
Blur & Pixelate ImageBlur or pixelate faces, plates and private details in part or all of an image.
Favicon GeneratorMake favicon.ico, Apple touch and Android icons from an image or text.
EXIF Viewer & RemoverSee hidden photo metadata like GPS location and camera, then strip it.
Combine ImagesJoin photos side by side, stacked or in a grid, into one image.
QR Code ScannerRead QR codes from an image, a screenshot or your camera.
Calculators All 25 →
Percentage CalculatorX% of Y, what percent, percentage change and increase/decrease.
Loan CalculatorMonthly payment, total interest and a full amortization schedule.
BMI CalculatorBody Mass Index in metric or imperial units, with the WHO category.
Date Difference CalculatorDays, weeks, months and business days between two dates.
Unit ConverterLength, weight, temperature, volume, area, speed, data and time.
Age CalculatorExact age in years, months and days, plus days to your next birthday.
Tip CalculatorWork out the tip and split the bill between any number of people.
Compound Interest CalculatorSee how savings grow with compounding and monthly contributions.
Discount CalculatorSale price and savings, including stacked discounts and sales tax.
Calorie Calculator (BMR & TDEE)Estimate daily calorie needs from BMR and activity level.
Add or Subtract Days from a DateFind the date N days, weeks, months or business days from any date.
Time Zone ConverterConvert a time between cities and time zones, with daylight saving.
Random Number GeneratorRandom numbers in any range, with or without repeats, or shuffle a list.
Mortgage CalculatorMonthly mortgage payment with property tax, insurance, HOA and PMI.
Hourly to Salary CalculatorConvert hourly wage to annual, monthly and weekly pay — and back.
Sales Tax CalculatorAdd sales tax or VAT to a price, or extract it from a tax-inclusive total.
Hours & Time Card CalculatorAdd up hours worked from start and end times, minus breaks, for a week.
GPA CalculatorCalculate your semester or cumulative GPA on the 4.0 scale.
Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, simplified.
Mean, Median, Mode & Standard DeviationAverage, median, mode, range, variance and standard deviation of a data set.
Scientific CalculatorTrig, logs, powers, roots, factorials and constants with history.
Aspect Ratio CalculatorFind width or height for a ratio like 16:9, or simplify any resolution.
Roman Numeral ConverterConvert numbers to Roman numerals and back, with validation.
Profit Margin & Markup CalculatorMargin, markup, profit and selling price from cost and price.
Running Pace CalculatorPace, time or distance for runs, with race finish-time predictions.
Why SB Tools?
Private by design. Every tool on SB Tools runs inside your browser. Your PDFs, photos, tokens and data are processed on your own device and are never uploaded to our servers — there is no server-side processing at all.
Fast and focused. Pages are lightweight and open instantly. Each tool does one job well, with sensible defaults, clear errors and nothing to install.
No signup, no limits. No accounts, no daily quotas and no watermarks. Bookmark the tools you use and they will be there when you need them.
Smart Paste. Not sure which tool you need? Paste your data into the box above. SB Tools recognizes JSON, JWTs, timestamps, Base64, URLs, cron expressions, colors and UUIDs, shows a quick result and sends you to the right tool.