Free Online Tools — PDF, Calculators, SEO, Image, Social Media, Developer Utilities & More

Combine multiple PDF files into one document, instantly and privately in your browser.

Reduce PDF file size for email and web uploads while keeping good visual quality.

Rotate pages of a PDF 90°, 180° or 270° and save the corrected copy instantly.

Convert each page of a PDF into a high-quality JPG image, ready to use anywhere.

Combine multiple JPG/PNG images into a single, printable PDF with custom page size.

Insert automatic page numbers onto every page of a PDF with custom style and position.

Stamp a text or image watermark across PDF pages to mark drafts or ownership.

Remove specific pages or ranges from a PDF and export the trimmed document.

Write rich text with headings, lists and images, then export it as a polished PDF.

Extract clean, selectable text from a PDF for quick copying, pasting and editing.

Count words, characters, sentences and paragraphs in real time as you type.

Count every character (with or without spaces) in a piece of text — instantly.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case and more.

Read any text aloud with your browser's built-in voices — no account, no limits.

Repeat any text N times with a custom separator — useful for tests, filler and loops.

Strip newlines out of text so you can paste multi-line content as a single line.

Convert plain text into binary (01001000…) and binary back to text — both directions.

A distraction-free notepad that auto-saves your notes in your browser — no signup.

Measure your typing speed (WPM) and accuracy with a 60-second in-browser test.

Compute any of the three classic percentage problems (X % of Y, X is what % of Y, etc).

Classic WHO BMI check from weight and height, with the healthy-weight range for your height.

Full scientific calculator with trigonometry, logarithms, factorials and memory keys.

Convert between common units of length, weight, volume, temperature and speed.

Bidirectional % change between two numbers — or apply a known % to a base value.

Find profit, margin and markup, or the price for a target margin.

Selling price from markup %, or the markup from cost and price.

Split a bill with tax, tip and service charge, equally or custom.

Mean, median, mode, range and weighted average of a list of numbers.

Simplify ratios, split amounts by ratio and solve a : b = c : x.

Add, subtract, multiply, divide and compare fractions with steps.

Compare two values with percentage difference and percentage change.

Estimate weighted or unweighted GPA on 4.0, 5.0 or custom scales.

Work out your current grade and the score needed for a target.

Add up room areas in sq ft, sq yd and m², with an optional waste allowance.

Estimate litres or gallons of paint and containers, minus doors and windows.

Count tiles and boxes for floors and walls, including grout gap and waste.

Concrete volume in cu ft, cu yd and m³ for slabs, footings, walls and pads.

Solve triangles (SSS, SAS, ASA, AAS, SSA, right) with a labelled diagram.

Sample or population standard deviation and variance with full working.

Find radius, diameter, circumference and area from any one value, with formulas.

Area, perimeter, diagonal and aspect ratio from length and width, with square mode.

Volume and surface areas of a cylinder from radius or diameter and height.

Real or complex roots, discriminant, vertex and a graph for ax² + bx + c = 0.

Exact nPr, nCr, nʳ and (n+r−1)Cr with formulas and full results.

LCM and GCF of 2–50 integers with prime factorizations and working.

Convert between Unix timestamps (seconds since 1970) and human-readable dates.

Countdown to any future date and time with live days / hours / minutes / seconds.

Convert a date-time from one city/time-zone to another without spreadsheet math.

Years, months, days, total days/weeks/hours lived and days until next birthday.

Precise elapsed time between two date-times in days, hours, minutes and seconds.

Days, weeks, months, years and weekdays between any two calendar dates.

Build a compliant block with title, description, Open Graph and Twitter cards.

Percent-encode unsafe URL characters or decode a raw URL back to human-readable form.

Convert an image file (JPG, PNG, GIF, SVG) into a Base64 data-URI for inline embedding.

Preview a data-URI string in the browser and download the decoded image.

Shrink JPG and PNG files by 40–80% for faster websites and smaller emails.

Change image dimensions (keep or free aspect ratio) for thumbnails, avatars and uploads.

Turn any image into a 16/32/48/180/192/512 icon pack for websites and PWAs.

Crop with aspect presets, rotate 90°, flip, and export PNG, JPG or WebP.

Batch convert JPG, PNG and WebP files, resize them, and download a ZIP.

Cut out the main subject and download a transparent PNG.

Pull dominant colours from an image as HEX, RGB, HSL and CSS.

Add text or logo watermarks to many images at once, then download as a ZIP.

Strip EXIF, GPS and other embedded metadata by re-saving images locally.

Combine 2–9 photos into a grid or featured layout with borders and gaps.

Create an animated GIF from 2–20 images with timing and loop controls.

Shrink static and animated GIFs while keeping animation and transparency.

Blur or pixelate a whole image or chosen areas with movable zones.

Sanitise and shrink SVG code with before/after previews and bytes saved.

Turn SVG into PNG at any size and 1×–3× scale, transparent or solid.

Cut images into grid tiles, slices or an Instagram panorama, with a ZIP.

Add borders, rounded corners, padding and shadows to images.

Mark up screenshots with arrows, text, shapes, freehand and blur.

Compare two images side by side, by slider or as a pixel diff.

Sample exact pixel colours as HEX, RGB, HSL, HSV and CSS with a magnifier.

RGB and luminance histograms with statistics, CSV and chart download.

Blend two images with multiply, screen, overlay and more, then export.

Map image brightness to two colours for a duotone effect.

Turn images into ASCII text art with custom character sets.

Pack images into a sprite sheet with JSON and CSS coordinate maps.

Generate a high-resolution QR code for any URL, vCard, Wi-Fi password or plain text.

Decode any Base64 string — image, PDF, document — and download it as a real file.

Compute the 128-bit MD5 hash of any text or file for checksums and deduplication.

Compute the 256-bit SHA-256 hash of any text for secure integrity checks.

Create a strong, random password with custom length, case, digits and symbols.

Strip whitespace and comments from HTML, JavaScript and CSS to shrink your production files.

Re-format minified or compressed JS, HTML and CSS back into readable, indented code.

Pretty-print, minify and validate JSON with helpful error positions.

Encode UTF-8 text to Base64 or decode Base64 back to text — fully client-side.

Turn a topic or phrase into a batch of relevant, on-trend social-media hashtags.

Grab the high-resolution thumbnail image from any public YouTube video URL.

Calculate BMI with female-specific health ranges and tips.

Age- and gender-aware BMI interpretation with an ideal weight range.

Ideal body weight using the Devine, Robinson, Miller and Hamwi formulas.

Plan a safe daily calorie deficit to hit your target weight by a target date.

Daily calorie burn (TDEE) using Mifflin-St Jeor BMR × activity multiplier.

Daily protein target (g/kg) for muscle gain, maintenance or cutting.

Daily water recommendation based on weight, exercise and climate.

Estimate body-fat % using the trusted U.S. Navy circumference method.

Monthly EMI plus full month-by-month repayment schedule for any loan.

Project the future value of a Systematic Investment Plan with monthly contributions.

Add or remove GST with CGST/SGST split for intra-state or IGST for inter-state supply.

Convert monthly CTC to hourly, daily, weekly and yearly equivalents.

How much loan you qualify for based on income, existing EMIs and FOIR.

Final price after discount and tax, with all intermediate components shown.

Password-protect a PDF or remove the password — one combined client-side tool.

Insert an image onto an existing PDF page at a position and size you choose.

View and edit PDF title, author, subject and keyword metadata.

Break down a PDF's total size into pages, images, fonts and structural bytes.

Count the pages in one or many PDFs with per-document size and dimensions.

Render every page of a PDF into a PNG thumbnail you can download individually.

Turn phone-camera document photos into a clean, document-style PDF.

Convert every page of a colour PDF to neutral grayscale for printing and archiving.

Threshold a PDF to pure black and white — smallest files, crispest text.

Download every embedded image from a PDF as individual PNG files.

Cover an image on a PDF page with a new image of your choice (overlay-based).

Extract specific pages or ranges from a PDF into a new file (replaces Split PDF).

Reorder PDF pages by typing the new sequence (replaces drag-Reorder Pages).

Split weekly study hours across subjects and days with Pomodoro sessions.

25/5 Pomodoro timer with persistent session count, configurable durations.

Add habits, tick them daily, and watch your 30-day grid fill up — streaks tracked.

Log daily expenses by category, see today/week/month totals, export CSV.

Compare a meeting time across time zones with working-hour checks.

Make a printable month, year or 12-month calendar with your own notes.

Convert dates between ISO, US, European, readable and Unix formats.

Weekday, day of year and leap-year check for any date.

ISO week number and week-year of a date, or the date for an ISO week.

Add or subtract years, months, weeks, days or business days from a date.

Total shift hours, breaks and overtime, with a weekly CSV timesheet.

Count working days between dates or add business days to a date.

Stopwatch with laps, splits, fastest and slowest lap, and CSV export.

Work/rest intervals with rounds, prep and cool-down phases.

Plan a week of shifts, including overnight shifts, with planned-hour totals.

Make a downloadable .ics calendar event with a live preview.

List daily, weekly, monthly or yearly repeating dates with clear rules.

Add or subtract hours, minutes and seconds, with day offsets.

Insert a blank page at the start, end or after any page of an existing PDF — no upload.

Trim margins from every page of a PDF (or a specific range) with exact point precision.

Turn PDF pages into PNG images with page ranges, DPI and a ZIP download.

Convert PDF pages to WebP images with quality, DPI and ZIP download.

Resize PDF pages to A4, Letter or custom sizes, portrait or landscape.

Add header and footer text with page, date and filename tokens.

Place a drawn, typed or uploaded signature image on PDF pages.

Open a PDF in your browser with thumbnails, zoom, rotate and search.

Build a spec-correct robots.txt with allow / disallow rules per user-agent and sitemap.

Test JavaScript regex with live highlighting, groups and flags.

Create up to 1,000 secure random UUID v4 values at once.

Convert JSON to YAML and back, with safe parsing and clear errors.

Compare two JSON documents by path: added, removed and changed.

Read a JWT’s header, payload and claims locally (no verification).

Split a URL into parts and edit its query parameters live.

Beautify or minify SQL with indentation and keyword-case options.

Build linear, radial and conic gradients and copy the CSS.

Encode text to HTML entities or decode named, decimal and hex entities.

Convert between HEX, RGB, HSL, HSV and named colours with a live picker.

Build layered CSS box-shadow effects with a live preview.

Build flexbox layouts visually and copy the generated CSS.

Design CSS Grid layouts visually and copy the generated CSS.

Build five-field cron expressions and preview the next 10 run times.

Build @keyframes animations from presets with a live, replayable preview.

Draw inset, circle, ellipse and polygon clip-paths with draggable points.

Combine CSS filters on a live preview and export the CSS or a filtered image.

Translate, rotate, scale and skew with a live preview and origin control.

Layer multiple text shadows with offset, blur, colour and opacity.

Round corners with linked or separate, elliptical radii in px or %.

Password-based AES-256-GCM text encryption with a portable JSON envelope.

HMAC-SHA-256/384/512 for text or files, with hex and Base64 output.

SHA-512 checksums for text or files in hex and Base64.

Build and check a CSP header or meta tag with risk warnings.

Security headers for Apache, Nginx, Netlify and Vercel with notes.

Detect a file’s real type from its signature and spot extension mismatches.

Check JSON against a schema subset of Draft 2020-12 with clear error paths.

Run JSONPath queries on JSON and see matching paths and values.

Run XPath 1.0 queries on pasted XML with namespace prefixes.

Build safely quoted cURL commands for Bash, PowerShell and CMD.

Convert chmod permissions between checkboxes, octal and rwx notation.

Combine .gitignore templates and custom lines without duplicates.

See how much interest and tenure you save by making a lump-sum prepayment on a running loan.

FY 2024-25 new & old regime tax with surcharge, cess, 87A rebate and slab-wise breakdown.

Compound interest on FD, RD or savings deposits with your choice of compounding frequency.

Units to sell and revenue threshold required to cover all fixed and variable costs.

Annualised growth rate between two values, with formula breakdown.

Estimate net gain, simple ROI and annualised return from your own figures.

List assets and liabilities to estimate your net worth, with a CSV download.

Estimate payoff time, interest and a monthly schedule for a single debt.

Estimate an emergency fund target from your essential monthly costs.

Estimate time to a savings goal or the monthly amount for a target date.

Estimate future cost or purchasing power with an inflation rate you enter.

Project retirement savings with monthly compounding and a yearly table.

Weighted average cost across purchase lots, including fees.

Dividend yield and income from the price and dividend you enter.

Straight-line and declining-balance schedules that stop at salvage value.

Quick doubling-time estimates with the Rule of 72 and exact comparison.

See the long-term effect of an expense ratio on projected value.

Find today’s value of a future amount with any compounding and optional inflation.

Project lump-sum growth with any compounding, plus an inflation-adjusted value.

Estimate regular withdrawals that run a balance down over a chosen period.

Estimate payoff time, interest and schedule for one card balance.

Percentage, fixed or tiered commission plus base, bonus and deductions.

Compare two loan offers’ payments, interest, fees and total cost side by side.

Convert glucose readings between mg/dL and mmol/L with normal-range diabetes guide.

Find the kilograms and percentage by which you are above your ideal weight range for height.

Estimate a due date, gestational age and trimester dates from the last period.

Plan bedtimes or wake-up times around approximate 90-minute sleep cycles.

Estimate max heart rate and moderate and vigorous heart-rate ranges.

Estimate 1RM with Epley and Brzycki, plus a percentage table.

Estimate lean body mass and fat mass with the Boer formula.

Work out your waist-to-height ratio in metric or imperial units.

Work out waist ÷ hip with clear conversions and the formula shown.

Turn your own calorie target into protein, carb and fat grams per day.

Estimate calories for an activity using MET × weight × time.

Pace, speed, finish time and splits for any distance, in km or miles.

Compare Mosteller, Du Bois and Haycock BSA estimates in m².

Calendar estimate of next period, ovulation and fertile window.

Generate five on-trend caption variations for any topic, platform and tone in seconds.

SEO-friendly YouTube titles and a structured video description from your topic in seconds.

Live character & word count with colour-coded warnings for every major social platform.

Split one wide image into 2–10 seamless carousel slides.

Make a 2560×1440 channel banner with a safe-area guide.

Design 1280 × 720 or 1920 × 1080 thumbnails with text, logo and guides.

Design square, portrait and landscape post images with text layers and a sticker.

Create 9:16 story images with text, a sticker and an edge guide.

Design vertical video cover images with a big title, subtitle and sticker.

Create personal profile banners and Company Page covers with text and a logo.

Add top and bottom text, a caption and a watermark to your own image.

Design a 1500 × 500 px X header with text, logo and crop guides.

Create an 851 × 315 px Facebook Page cover with text and logo.

Design Pinterest Pins with up to three text layers and a logo.

Create LinkedIn post images in horizontal, square or vertical sizes.

Make a vertical 9:16 Shorts thumbnail image with title and logo.

Make a square profile picture with a circle crop guide and initials.

Create 1200 × 630 Facebook post images with text, logo and safe margins.

Make 1600 × 900 images for X posts with text, logo and image fitting.

Create 1080 × 1920 Reel covers with centre-area and crop guides.

Square Highlight covers from colours, emoji or logos with a circle guide.

Plan 1920 × 1080 end screen backgrounds with placeholder guides.

Design 1200 × 480 Twitch profile banners with a safer-area guide.

Paste a page's HTML and grade its SEO meta tags with length and best-practice warnings.

Count total words and rank the top keywords by frequency and density percentage.

Build a valid sitemap.xml from a list of URLs, with priority and change-frequency per row.

List every link in HTML with type, rel and target, then filter and export.

Outline H1–H6 headings and flag hierarchy problems in your HTML.

Preview title and description as an illustrative desktop and mobile result.

Build hreflang link tags for language and region versions of a page.

Check sitemap.xml syntax and structure locally, with a downloadable report.

Check which robots.txt rules allow or block your URL paths, locally.

Create redirect rules for Apache, Nginx, Netlify and Vercel.

Create a clean rel=canonical tag, with tracking parameters removed.

Add correctly encoded UTM tags to any link, copy it, or export CSV.

Build JSON-LD for 8 schema.org types with required-field checks.

Find missing, duplicate, conflicting or malformed canonical tags in pasted HTML.

Check JSON-LD syntax and key schema.org properties with exact JSON paths.

Check hreflang codes, x-default, duplicates and URLs, and get corrected tags.

Build a meta robots tag and X-Robots-Tag header with conflict checks.

Turn a list of URLs into an accessible, grouped HTML sitemap page.

Write Open Graph and Twitter/X tags and see approximate preview cards.

Real-time essay analysis: introduction, thesis, body topic sentences, transitions and readability score.

Compare your current draft against your own saved drafts to catch accidentally reused phrasing — runs in your browser.

Clean up any list by removing repeated lines, with case and whitespace options.

Turn plain text into Markdown with live bold, italic, heading and list controls.

Sort lines alphabetically, by length, numerically, or shuffle them randomly.

Reverse text by characters, words, lines or sentences — five modes in one tool.

Create classic Lorem Ipsum placeholder text by words, sentences or paragraphs.

Generate random strings, usernames, sentences and test data with custom length and charset.

Convert CSV data into well-formed JSON with delimiter auto-detection and type coercion.

Compare two texts side-by-side and highlight added, removed and unchanged lines.

Pretty-print, minify and validate any XML document right in your browser.

Estimate readability with Flesch, Flesch-Kincaid and Gunning Fog scores.

Turn CSV data into responsive, escaped HTML table code.

Strip HTML tags into clean, readable plain text.

Convert titles into clean URL slugs, one at a time or in bulk.

Find and replace text with match highlighting, regex and undo.

Write Markdown with a live, safe preview and download it as .md or .html.

Turn JSON arrays into CSV with nested-data options, column order and a preview.

Convert XML to JSON with @attributes, #text and arrays, safely in your browser.

Convert JSON to well-formed, escaped XML with attributes, arrays and indentation.

View and edit CSV/TSV in a table, then export spreadsheet-safe CSV or TSV.

Build Markdown pipe tables in a grid with alignment, escaping and a preview.

Build a clean HTML and plain-text email signature with simple layouts.