All Tools

Browse every free tool on DigitalQuiver Tools, grouped by category, or search for what you need below.

Image Tools (25 tools)

Image CompressorShrink an image's file size right in your browser, before you download it. Image ResizerResize an image to exact dimensions, with optional locked aspect ratio. Image Format ConverterConvert an image between PNG, JPEG and WebP formats. Image RotatorRotate or flip an image in your browser and download the result. Add Border to ImageAdd a solid color border or frame around a photo and download it. Black & White ImageConvert a photo to black & white (grayscale) in your browser. Pixelate ImagePixelate a photo or blur out part of it, right in your browser. Add Text to an ImageAdd a custom text caption or label onto a photo, right in your browser. Image Metadata ViewerView the EXIF metadata hidden inside a photo, right in your browser. Round Image MakerCrop a photo into a perfect circle for a profile picture, right in your browser. Crop ImageCrop a photo to any area or aspect ratio, right in your browser. Combine ImagesCombine two or more images side by side or stacked, right in your browser. Image SplitterCut an image into a grid of equal pieces, right in your browser. Add Images (Overlay)Overlay one image (like a logo or sticker) onto another photo. Remove BackgroundRemove the background from any photo — people, products or objects — right in your browser. PNG to JPGConvert a PNG image to JPG, right in your browser. JPG to PNGConvert a JPG image to PNG, right in your browser. PNG to WebPConvert a PNG image to WebP, right in your browser. JPG to WebPConvert a JPG image to WebP, right in your browser. WebP to PNGConvert a WebP image to PNG, right in your browser. WebP to JPGConvert a WebP image to JPG, right in your browser. SVG to PNGConvert an SVG vector graphic to a PNG image, right in your browser. Image to Text (OCR) ConverterExtract text from a photo or screenshot, entirely in your browser. QR Code ScannerDecode a QR code from an uploaded image or your camera, right in your browser. Favicon GeneratorTurn any image into a full favicon set — .ico, PNGs and the HTML tags to paste in.

PDF Tools (9 tools)

PDF MergeCombine multiple PDF files into one, in the order you choose. PDF SplitExtract a page range from a PDF into a brand new file. PDF CompressOptimize a PDF's internal structure to reduce its file size. Rotate PDFRotate every page in a PDF by 90, 180 or 270 degrees. Reorder PDF PagesDrag and drop to rearrange the pages of a PDF. JPG to PDFCombine one or more images into a single PDF file. PDF to JPGRender each page of a PDF as a downloadable JPG image. Protect PDFAdd a password to a PDF so only people who know it can open it. Add Watermark to PDFStamp a text watermark onto every page of a PDF, with custom opacity, angle and color.

Text Tools (12 tools)

Word CounterCount words, characters, sentences and paragraphs instantly. Online NotepadA distraction-free notepad that auto-saves in your browser. Character CounterLive character count with handy social media limit presets. Remove Extra SpacesClean up messy text by collapsing extra spaces and blank lines. Text SorterSort lines of text alphabetically, A-Z or Z-A, in one click. Duplicate Line RemoverStrip out repeated lines while keeping the original order. Text Case ConverterConvert text between UPPERCASE, lowercase, Title Case, camelCase and more. Text to Speech (Read Aloud)Have any text read aloud, using your browser's built-in voices. Line Joiner (Merge Lines)Join multiple lines into one, with a custom separator. Readability Score CalculatorCalculate Flesch Reading Ease and Flesch-Kincaid Grade Level from any text. Reading Time EstimatorEstimate how long an article takes to read from its word count. Syllable CounterCount syllables in a word or block of text, word by word.

YouTube Tools (4 tools)

YouTube Thumbnail DownloaderGet any YouTube video's thumbnail in every available resolution. YouTube Video ID / URL ExtractorPull the video ID out of any YouTube link, and get every URL format back. YouTube Embed Code GeneratorTurn any YouTube link into ready-to-paste embed HTML, with custom options. YouTube Ad Revenue EstimatorEstimate potential ad earnings from views, using RPM or CPM.

Developer Tools (20 tools)

JSON FormatterFormat, validate and minify JSON, with clear error messages. YAML FormatterFormat YAML, validate it, and convert it to JSON. HTML FormatterBeautify messy or minified HTML with proper indentation. CSS FormatterBeautify minified or messy CSS with clean indentation. JavaScript FormatterBeautify minified or messy JavaScript code instantly. SQL FormatterFormat SQL queries with proper line breaks and indentation. XML FormatterFormat and validate XML with clean, nested indentation. Regex TesterTest a regular expression against sample text with live match highlighting. Cron Expression GeneratorBuild a cron expression, or paste one in to see it explained in plain English. URL ParserBreak a URL down into its protocol, host, path, query params and hash. JSON Schema GeneratorGenerate a JSON Schema from a sample JSON object automatically. DNS LookupLook up a domain's DNS records (A, MX, TXT, NS and more). IP LookupLook up your own public IP address, or geolocation info for any IP. Timestamp / Unix Time ConverterConvert Unix timestamps to human-readable dates, and back. Text Diff CheckerCompare two pieces of text and see exactly what changed, line by line. Color Contrast Checker (WCAG)Check if a text/background color pair passes WCAG accessibility contrast rules. CSS Gradient GeneratorBuild a linear or radial CSS gradient visually and copy the code. Social Share Preview (Open Graph)See how a title, description and image will look when shared on social media. HTTP Status Code ReferenceLook up what any HTTP status code means, with a searchable list. Markdown to HTML ConverterConvert Markdown to clean HTML with a live preview.

AI Tools (18 tools)

Prompt FormatterFormat a system + user prompt into the JSON shape LLM APIs expect. Prompt DiffCompare two versions of a prompt and see exactly what changed. AI Token CounterEstimate how many tokens a prompt will use, for GPT- and Claude-style models. LLM Cost CalculatorEstimate the cost of an LLM API call from your token counts and pricing. Context Window CalculatorSee how much of a model's context window your prompt would use. RAG Chunk CalculatorSee how a document would be split into chunks for a RAG pipeline. Cosine Similarity CalculatorCalculate the cosine similarity between two numeric vectors (e.g. embeddings). Prompt Injection ScannerScan text for common prompt-injection phrasing patterns. AI Model Pricing Comparison TableCompare Claude, GPT and Gemini API pricing per million tokens, and estimate your cost. AI Image Prompt FormatterBuild a properly formatted Midjourney or Stable Diffusion prompt from simple fields. JSON to Markdown Table ConverterTurn a JSON array of objects into a readable Markdown table instantly. Function Calling / Tool Schema ConverterDescribe a function once, get OpenAI and Anthropic tool-use JSON schemas side by side. AI Response Markdown CleanerStrip **, #, - and other Markdown syntax from AI chat output, leaving plain text. Prompt Template Variable FillerTurn a {{variable}} prompt template into a fill-in form, reusable every time. Custom Instructions Character Limit CheckerCheck your ChatGPT or Claude custom instructions against common character limits. Embedding Vector VisualizerPaste embedding vectors and see them plotted in 2D using PCA. Language DetectorIdentify the likely language of any pasted text, instantly in your browser. Sentiment Analysis ToolScore the positive or negative tone of any text using a word-valence lexicon.

Health & Fitness Tools (9 tools)

Body Fat Percentage CalculatorEstimate your body fat percentage using the U.S. Navy circumference method. One-Rep Max CalculatorEstimate your one-rep max from any weight and rep count using the Epley and Brzycki formulas. Calories Burned CalculatorEstimate calories burned for an activity using standard MET values. Macro CalculatorSplit a daily calorie target into protein, carb and fat grams for your goal. Heart Rate Zone CalculatorFind your training heart rate zones using the Karvonen method. Ideal Body Weight CalculatorCompare your ideal body weight across four established medical formulas. Water Intake CalculatorEstimate your daily water needs from body weight and activity level. Ovulation CalculatorEstimate your ovulation date and fertile window from your last period and cycle length. Sleep CalculatorFind the best bedtime or wake-up time based on 90-minute sleep cycles.

Calculators (20 tools)

Age CalculatorFind your exact age in years, months and days. Percentage CalculatorThree common percentage calculations in one simple tool. BMI CalculatorCalculate Body Mass Index using metric or imperial units. Discount CalculatorWork out sale prices, savings and optional tax in one step. Tip CalculatorSplit the bill and calculate the tip in seconds. Date CalculatorFind the difference between two dates, or add/subtract days from a date. BMR / TDEE CalculatorEstimate your daily calorie needs based on activity level. GPA CalculatorCalculate your GPA on the standard 4.0 scale from course grades and credit hours. Pregnancy Due Date CalculatorEstimate a pregnancy due date from your last period or conception date. Grade CalculatorCalculate your final course grade from weighted assignments and exams. Running Pace CalculatorCalculate pace, time or distance for any run, including common race distances. Statistics CalculatorCalculate mean, median, mode, range and standard deviation from a list of numbers. Paint CalculatorCalculate how many gallons or liters of paint you need for a room. Fuel Cost CalculatorCalculate the fuel cost for a trip from distance, fuel economy and price. Bill Split CalculatorSplit a bill with tip and tax evenly among any number of people. Age Difference CalculatorCalculate the exact age difference between two people in years, months and days. Concrete CalculatorCalculate how much concrete (cubic yards and bags) you need for a slab. Electricity Bill CalculatorCalculate the running cost of an appliance from its wattage, usage and your electricity rate. Aspect Ratio CalculatorCalculate the missing width or height to match a target aspect ratio. Video File Size CalculatorEstimate a video file's size from its resolution, bitrate and duration.

Loan & Debt Calculators (4 tools)

Loan Payment CalculatorEstimate monthly payments and total interest on any loan. Mortgage CalculatorEstimate your full monthly mortgage payment, including tax, insurance and PMI. Debt Payoff CalculatorCompare the snowball and avalanche methods to pay off multiple debts faster. Loan Amortization Schedule CalculatorSee the full month-by-month breakdown of principal and interest on a loan.

Business & Finance Calculators (13 tools)

Simple Interest CalculatorCalculate simple interest and total amount in seconds. Compound Interest CalculatorSee how your money grows with compounding over time. Sales Tax CalculatorCalculate sales tax and total price, or back out the pre-tax price from a total. Work Hours CalculatorCalculate weekly work hours from clock-in/out times, breaks and overtime. Retirement Savings CalculatorProject your retirement savings growth from regular contributions and compound interest. Rent Affordability CalculatorFind how much rent you can afford based on your income. Break-Even Point CalculatorCalculate how many units you need to sell to cover your fixed costs. Business Days CalculatorCalculate the number of business days between two dates, excluding weekends. Cap Rate CalculatorCalculate a rental property's capitalization rate from NOI and property value. Car Depreciation CalculatorEstimate a car's current value using the typical first-year and annual depreciation rule. Hourly to Salary CalculatorConvert an hourly wage to annual, monthly and weekly salary, or the reverse. Net Worth CalculatorCalculate your net worth from your assets and liabilities. Emergency Fund CalculatorCalculate how much you need saved for 3-6 months of expenses.

Generators (13 tools)

Password GeneratorCreate strong, random passwords using your browser's secure randomness. UUID GeneratorGenerate one or many version-4 UUIDs / GUIDs instantly. QR Code GeneratorTurn any text, link or Wi-Fi detail into a downloadable QR code. Lorem Ipsum GeneratorGenerate placeholder Lorem Ipsum text by paragraph, sentence or word. Random Number GeneratorGenerate random whole or decimal numbers within any range. Random Color Palette GeneratorGenerate harmonious color palettes for design projects, one click at a time. Signature GeneratorDraw a signature with your mouse or finger and download it as a PNG. Diceware Passphrase GeneratorGenerate a memorable, word-based passphrase using secure randomness. Dice Roller & Coin FlipRoll virtual dice or flip a coin using true browser randomness. Citation GeneratorGenerate APA, MLA or Chicago style citations for a website, book or journal article. UTM Link BuilderBuild a campaign-tracking URL with UTM source, medium and campaign parameters. Invoice GeneratorCreate a professional invoice with line items, tax and totals, then download it as a PDF. Resume / CV BuilderBuild an ATS-friendly resume with a live preview, then download it as a PDF.

SEO Tools (5 tools)

Meta Tag GeneratorBuild title, description, Open Graph and Twitter Card meta tags. Robots.txt GeneratorBuild a valid robots.txt file to control search engine crawling. Sitemap GeneratorTurn a list of URLs into a valid XML sitemap. SERP PreviewSee how your page's title and description would look in Google search results. Keyword Density CheckerSee how often each word or phrase appears in your content, as a percentage.

Amazon Seller Tools (25 tools) See all Amazon tools & guides →

FBA Profit & ROI CalculatorWork out your real profit, margin and ROI on any Amazon FBA product. FBA Dimensional Weight CalculatorCalculate dimensional weight from package dimensions using Amazon's divisor. PPC ACOS/ROAS CalculatorCalculate ACOS, ROAS and your break-even ad spend for Amazon PPC. Profit Margin CalculatorCalculate profit, margin % and markup % from cost and selling price. KDP Royalty CalculatorEstimate your Kindle eBook, paperback or hardcover royalty using Amazon's published formulas. KDP Spine Width CalculatorCalculate paperback spine width from page count and paper type. Amazon Title/Bullet Character CounterLive character counts for your Amazon listing title and bullet points. ASIN ExtractorExtract ASINs from any Amazon product URL, one per line. UPC/EAN Barcode Check Digit ValidatorValidate or calculate the check digit for UPC-A and EAN-13 barcodes. Book Description HTML FormatterFormat bold, italic, headings and lists into HTML your KDP book description accepts. Amazon Referral Fee CalculatorCalculate Amazon's referral fee and your net proceeds from price and fee %. KENP Royalty CalculatorEstimate your KDP Select Global Fund royalty from pages read and this month's rate. ISBN/EAN-13 Barcode GeneratorGenerate a scannable EAN-13 barcode SVG from an ISBN or 12/13-digit code. KDP Bleed, Margin & Gutter CalculatorCalculate your KDP interior page size, gutter and margins from trim size and page count. Amazon Backend Search Term Byte CounterCount your backend keywords against Amazon's 250-byte limit before you save. FBA vs FBM Cost ComparisonCompare per-unit profit between Fulfilled by Amazon and Fulfilled by Merchant. Break-Even Selling Price CalculatorWork backward from your target profit to find the price you need to charge. Inventory Reorder Point CalculatorKnow exactly when to reorder stock before you run out. FBA Prep & Labeling Cost CalculatorAdd up every prep cost per unit to find your true landed cost. Multi-Pack / Bundle Profit CalculatorSee whether bundling units into a multi-pack actually improves your per-unit profit. Amazon Referral Fee Category LookupLook up Amazon's referral fee percentage for common product categories. KDP Full Cover Wrap Size CalculatorCalculate the exact full-wrap cover dimensions for your paperback, including bleed and spine. Low-Content Interior Page GeneratorGenerate lined, graph or dot-grid interior pages as a ready-to-upload PDF. Merch by Amazon Design Spec CheckerCheck your design PNG against Amazon Merch's size, format and transparency rules. Merch by Amazon Print Area PreviewSee roughly how your design will sit within the printable area on a shirt.

Converters (14 tools)

Binary ConverterConvert binary numbers to decimal, hex and octal instantly, in either direction. Hex ConverterConvert hexadecimal values to decimal, binary and octal instantly, in either direction. Decimal ConverterConvert an everyday decimal number to binary, hex and octal instantly, in either direction. Octal ConverterConvert an octal number to decimal, binary and hex instantly, in either direction. ASCII ConverterConvert text to ASCII codes (decimal, hex or binary) and back. Morse Code TranslatorTranslate text to Morse code and back, both ways. CSV to JSON ConverterConvert between CSV and JSON in either direction, right in your browser. Color Picker / Color Code ConverterConvert between HEX, RGB, HSL and HSV, with an interactive picker and eyedropper. World Clock / Time Zone ConverterConvert a date and time between time zones, and compare several at once. Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin instantly. Roman Numeral ConverterConvert numbers to Roman numerals, and Roman numerals back to numbers. Length / Weight / Volume Unit ConverterConvert between metric and imperial units of length, weight and volume. Cooking Measurement ConverterConvert between cups, tablespoons, teaspoons, milliliters and other cooking volumes. Currency ConverterConvert between world currencies using live exchange rates.

Security & Hash (7 tools)

JWT DecoderDecode a JSON Web Token's header and payload instantly. Bcrypt Hash GeneratorHash text with bcrypt, and verify text against an existing hash. SHA-256 Hash GeneratorGenerate a SHA-256 hash of any text instantly. MD5 Hash GeneratorGenerate an MD5 checksum of any text instantly. HMAC GeneratorGenerate an HMAC signature from a message and secret key. Password Strength CheckerCheck how strong a password is, based on length and character variety. File Checksum VerifierCompute a file's SHA-256, SHA-1 or SHA-512 checksum to verify its integrity.

Encode / Decode (2 tools)

Base64 Encoder/DecoderEncode text to Base64 or decode Base64 back to text. URL Encoder/DecoderPercent-encode text for URLs, or decode it back to plain text.

Misc Tools (4 tools)

User Agent ParserBreak down any browser User-Agent string into browser, OS and device. Dog Age CalculatorConvert your dog's age to human years using the AKC breed-size chart. Golf Handicap CalculatorCalculate your Handicap Index from recent rounds using the official World Handicap System formula. Typing Speed Test (WPM Calculator)Test your typing speed in words per minute and accuracy, right in your browser.

Games & Puzzles (5 tools)

Daily Word GameGuess today's 5-letter word in 6 tries. A new word every day, same for everyone. SudokuPlay a freshly generated Sudoku puzzle, with three difficulty levels and instant checking. Word Search GeneratorTurn your own list of words into a playable, printable word search puzzle. Crossword Puzzle MakerTurn your own list of words and clues into a playable, printable crossword grid. Anagram Solver / Word UnscramblerFind every real word you can make from a set of letters.

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