ZapToolbox

Free online tools that just work ⚡

Compress images to any KB, merge PDFs, make QR & UPI codes, calculate GST, EMI and SIP — fast, free and private. Nothing is uploaded.

Image tools

Image CompressorShrink photos to an exact size (20 KB, 50 KB, 100 KB…) for exam forms, job portals and email — without…Image ResizerChange image dimensions precisely, including print sizes like 3.5 × 4.5 cm, with the aspect ratio locked or…JPG ⇄ PNG ⇄ WebP ConverterConvert WebP to JPG, PNG to JPG, JPG to PNG and more, many files at…Passport Photo MakerCrop your photo to the official size and print many copies on one 4×6 inch or A4…Online Signature MakerDraw your signature with your finger or mouse and download a clean, transparent…Crop ImageDrag the box to crop any photo, pick a ratio like 1:1 or 16:9, or type exact pixel values. Works with mouse…Rotate & Flip ImageFix sideways phone photos, straighten a tilted scan, or mirror a selfie — then download the corrected…Round Profile Picture MakerTurn any photo into a perfectly round profile picture with transparent corners, ready for WhatsApp,…Add Text to ImagePut captions, quotes, prices or names on any photo. Drag the text where you want it and style it with…Add Watermark to ImageProtect product photos and artwork with a text or logo watermark — tiled across the image or placed in a…Meme GeneratorAdd classic top and bottom meme text — big white letters with a black outline — to any picture from your…Blur / Pixelate Part of ImageCensor faces, number plates, phone numbers, Aadhaar or account numbers before sharing a photo or…Photo Filters & AdjustmentsBrighten dark photos, boost colours or give them a black-and-white or vintage look, with a live preview as…Image Color PickerFind the exact colour code of a logo, product or screenshot: click a pixel to get HEX, RGB and HSL, and see…Favicon GeneratorMake every icon a website needs — favicon.ico, 16/32/48 px PNGs, Apple touch icon and Android icons — from…Photo Collage MakerCombine 2 to 6 photos into one picture — perfect for before/after shots, product photos, birthdays and trip…Image to Base64 ConverterEncode any image as Base64 text for HTML, CSS, JSON or email templates — or paste Base64 to get the image…Add Border to ImageFrame photos with a coloured border and rounded corners, or post a whole photo on Instagram or WhatsApp…Exam Photo & Signature ResizerGet your photo, signature or thumb impression to the exact pixel size and KB range an online application form…

PDF tools

Image to PDFPerfect for scanned documents, receipts and assignments: put your images in order and save one tidy…Merge PDFJoin marksheets, certificates, invoices or chapters into a single PDF in…Split PDFCut a big PDF into smaller files: by page ranges, into single pages, or into equal parts of N…Extract PDF PagesTap the pages you want on the thumbnails (or type their numbers) and save just those pages as a new…Delete PDF PagesRemove blank, duplicate or unwanted pages — tap them on the thumbnails and save the PDF without…Rotate PDFTurn the whole PDF or just the sideways pages, preview the result on thumbnails, and save it…Rearrange PDF PagesDrag page thumbnails into the right order (or use the ← → buttons on phones) and save the reordered…PDF to JPG / PNGTurn every page (or chosen pages) of a PDF into sharp JPG or PNG images for WhatsApp, Instagram or upload…Compress PDFShrink heavy scanned PDFs for email and upload limits like 1 MB or 2 MB, with a clear before-and-after…Add Page Numbers to PDFNumber the pages of a project report, thesis or legal file — choose where the numbers go and how they…Add Watermark to PDFMark copies as “CONFIDENTIAL”, “COPY” or with your logo, so shared documents can’t be passed off as…Sign PDFDraw your signature with a finger or mouse (or upload a photo of it), click where it should go, and save the…PDF Metadata EditorSee the hidden title, author and software details inside a PDF, change them, or wipe them before…Text to PDFPaste notes, a letter or code and get a neatly formatted PDF with your choice of font, size and…Grayscale PDFSave colour ink and meet “black & white only” print rules by converting every page to…Crop PDFCut away wide white margins or scanner borders by setting how many millimetres to trim from each…Insert Pages into PDFSlip a missing page, an annexure or a blank separator page into exactly the right place in your…PDF Page Counter & InfoDrop one or many PDFs to count their pages and see page size, version, metadata and encryption at a…

QR codes

QR Code GeneratorMake a QR code for a link, restaurant menu, WiFi network, WhatsApp chat and more. Codes never…UPI QR Code GeneratorTurn your UPI ID into a payment QR code that customers can scan with any UPI app — free, with no…

Finance calculators

GST CalculatorAdd GST to a price, or find the GST included in a total — with the CGST/SGST or IGST…GST Invoice GeneratorFill in the details, add items, and print or save a clean GST invoice as PDF. Your details are remembered on…EMI CalculatorFind your monthly EMI and see how much interest you’ll pay over the…SIP CalculatorSee how a monthly SIP or a one-time investment could grow over…FD CalculatorFind out what your fixed deposit will be worth at maturity, and how much interest you’ll…RD CalculatorSave a fixed amount every month and see what your recurring deposit will be worth at…PPF CalculatorSee how your yearly PPF deposits grow over 15 years, with a year-by-year…Compound Interest CalculatorWork out compound interest for any amount, rate and period — and compare it with simple…Simple Interest CalculatorFind the simple interest and total amount for a loan or deposit — time in years, months or…Income Tax CalculatorCompare your tax under the new and old regime side by side and see which one saves you…HRA Exemption CalculatorFind how much of your house rent allowance is tax-free and how much is…Salary Calculator (CTC to In-hand)Turn your CTC into the monthly take-home salary that actually reaches your bank…Gratuity CalculatorEstimate the gratuity you will receive when you leave or retire after 5 or more…EPF CalculatorSee how your PF balance can grow until retirement with your and your employer’s monthly…Lumpsum CalculatorSee what a one-time investment could grow to — and what it is worth after…SWP CalculatorWithdraw a fixed amount every month from your investment and see how long the money…CAGR CalculatorFind the compound annual growth rate of an investment, or project a future value from a…Inflation CalculatorSee how much things will cost in the future — or what a future amount is really worth…Retirement Corpus CalculatorWork out how big a retirement fund you need — and how much to invest every month to get…Home Loan Eligibility CalculatorEstimate the maximum home loan banks may offer you, based on your income and existing…Loan Prepayment CalculatorFind out how much interest a part-prepayment saves — and whether to cut your tenure or your…Discount CalculatorWork out the sale price, how much you save, and what “40% + 10% extra” or “buy 2 get 1” really…Profit Margin CalculatorFind profit, margin and markup — or the selling price you need for a target margin, with…Number to Words (Rupees)Type an amount to get it in words for a cheque, invoice or form — Indian lakh/crore or international…Fuel Cost CalculatorFind out how much petrol or diesel your trip needs, what it will cost, and each person’s…Tip & Bill Split CalculatorAdd a tip, GST or service charge, and split the bill equally between everyone at the…

Everyday calculators

Age CalculatorFind your exact age from date of birth — or your age on a specific date, like an exam’s eligibility…Percentage CalculatorEvery common percentage question, answered as you…BMI CalculatorCheck your Body Mass Index and the healthy weight range for your…Unit ConverterConvert between common units — including sq ft, gaj (sq yard) and acre for property, and lakh/crore to…Calorie Calculator (BMR & TDEE)Find how many calories your body burns each day and how much to eat to lose, keep or gain…CGPA to Percentage CalculatorConvert your CGPA to a percentage (or percentage to CGPA) using the CBSE × 9.5 rule or your university’s…Marks Percentage CalculatorEnter your marks for each subject to get the total, overall percentage, per-subject percentage and…Random Number GeneratorPick one or more random numbers between any two values — great for lucky draws, raffles, games and choosing…Average Calculator (Mean, Median, Mode)Paste a list of numbers to get the average, median, mode, range, standard deviation and more in one…Scientific CalculatorA full scientific calculator in your browser — trigonometry, logs, powers, roots, factorials and brackets,…

Text tools

Word CounterPaste or type your text to count words, characters, sentences and reading time…Case ConverterFix text typed with Caps Lock on, or format headings and code names in one…Password GeneratorCreate a strong random password in one click. Generated on your device — never sent…Fancy Text GeneratorType your name or bio once and get 25 stylish font versions you can paste into Instagram, WhatsApp, Facebook,…Remove Duplicate LinesPaste a list of emails, phone numbers, keywords or names and get each line only once — in the original…Sort LinesPut any list in order: names A to Z, numbers smallest to largest, shortest lines first, or shuffle them…Find and Replace TextReplace a word, name or phrase everywhere in your text at once — with whole-word, case-sensitive and regex…Text Compare (Diff Checker)Paste the old and new versions of a document, code or list to see every added and removed line…Lorem Ipsum GeneratorGet dummy text for designs, mock-ups and templates — as many paragraphs, sentences or words as you…Remove Extra Spaces & Line BreaksClean up messy text copied from PDFs, emails and websites: double spaces, tabs, blank lines and broken…Text to SpeechPaste any text and listen to it in Hindi, Indian English or other voices available on your device. Change the…Speech to Text (Voice Typing)Speak and watch your words appear. Works in Google Chrome and Microsoft Edge with Hindi, Indian English and…Online NotepadWrite quick notes that save automatically on this device. No account, no cloud — download as a .txt file…Typing Speed TestType the passage as fast and accurately as you can. The timer starts with your first key…

Media tools

Screen RecorderRecord your screen, an app window or a browser tab — with your voice if you like — and download the video. No…Online Voice RecorderRecord voice notes, interviews, song practice or lectures from your microphone and download the audio —…Webcam Photo CaptureSnap a picture with your laptop webcam or phone camera, with an optional countdown timer, and download it…

Developer tools

JSON Formatter & ValidatorPaste JSON to pretty-print it, minify it, or find exactly where a syntax error…Base64 Encode / DecodeConvert text to Base64 and back — Hindi, emoji and every language work correctly. Also turns files into…URL Encode / DecodePercent-encode text for safe use in links and query strings, or decode a messy URL back into readable…Hash Generator (MD5, SHA-256)Get the checksum of any text or file, or paste an expected hash to verify a…UUID GeneratorCreate random, unique identifiers for databases, APIs and testing — one or a thousand at…Color Converter & Contrast CheckerConvert any colour between HEX, RGB, HSL and CMYK, and check whether text colours are readable (WCAG…Number Base ConverterConvert whole numbers between binary, octal, decimal, hexadecimal and any base up to 36 — with no size…Roman Numeral ConverterConvert any number from 1 to 3,999 into Roman numerals — or read Roman numerals as numbers — with the working…HTML Entity Encoder / DecoderEscape text so it displays safely inside HTML, or turn entities like < and ₹ back into normal…JWT DecoderPaste a JSON Web Token to read its header and claims and check when it expires. Nothing is sent…Unix Timestamp ConverterTurn a Unix timestamp into a readable date in IST and UTC, or a date into a timestamp. Seconds and…Barcode Generator (Code 128)Make a scannable Code 128 barcode for SKUs, inventory labels, invoices or shipping — download as PNG or…Regex TesterType a pattern and test text to see every match highlighted, with capture groups and a replace…CSS & HTML MinifierShrink CSS and HTML by removing comments and unneeded whitespace — safely, without touching strings or…

Date & time

Days Between DatesFind how many days, weeks and working days there are between any two dates — for notice periods, deadlines,…Add or Subtract Days from a DateFind the date that is a number of days, weeks, months or working days before or after any date — like 90 days…Countdown Timer & StopwatchA precise stopwatch with laps, and a countdown timer that beeps when time’s up — for study sessions, cooking,…Time Zone ConverterSee what time it is in New York, London, Dubai or Sydney for any time in India — or between any two…Pregnancy Due Date CalculatorEstimate your due date, how many weeks pregnant you are and your trimester — from your last period,…

Fun & random

Spin the Wheel — Random Name PickerType names or options, spin the wheel and let it choose — for classrooms, giveaways, games and tough…Dice Roller & Coin TossLost the dice for Ludo or Snakes & Ladders? Roll virtual dice or flip a coin — fair, instant and…Random Team GeneratorPaste names and split them into fair, random teams — for classroom groups, office activities, sports and…

Documents

Resume / CV BuilderFill in your details, watch your resume take shape on an A4 page, and save it as a PDF — free, with no…

Why ZapToolbox?

Private by design. Every tool runs inside your browser. Your photos, PDFs and documents never leave your device.

Free, no sign-up, no watermarks. Open a tool and use it — on your phone or computer.

Made for everyday needs in India. Compress photos for exam forms, make passport photos, generate UPI payment QR codes and GST invoices, and work out EMI and SIP in rupees.