Add a PDF Open Password and Test It
Apply a PDF opening password, verify the encrypted download in a fresh viewer, and distinguish password protection from redaction, signatures and access management.
With Protect PDF →Make the next task
a little easier.
Clear explanations, practical examples, and the tools to put them to work.
52 guides
Calculate Adult BMI and Understand Its Limits
Calculate an adult BMI from height and weight, check unit conversion, and understand why the category is a screening measure rather than a diagnosis.
With BMI Calculator →Calculate Age on a Specific Date
Calculate age at a chosen reference date, understand calendar years and days, and check leap-day and end-of-month conventions before using a result.
With Age Calculator →How to Calculate GST from an Inclusive Price
Extract GST from a tax-inclusive total using a supplied rate. Follow a worked example, use the calculator, and understand its tax and rounding limitations.
With GST Calculator →Calculate Percentages with the Right Base
Work out a percentage, a share of a total, or percentage change. Use examples to distinguish percentage points, reversed changes and zero baselines.
With Percentage Calculator →Check a Background-Removal Cutout
Create a transparent PNG cutout, compare ordinary and refined-edge results, and inspect hair, holes and fine detail without expecting a perfect segmentation.
With Background Remover →Check Income Tax Estimates for AY 2026–27
Check the calculator’s FY 2025–26 assumptions, distinguish gross from taxable income, and reproduce an illustrative resident salary calculation.
With Income Tax Calculator India →Check Text Hashes and Exact Input Bytes
Generate text digests, reproduce the SHA-256 abc test value, and understand UTF-8, whitespace, Unicode and the difference between hashes and authentication.
With Hash Generator →Check Word and Character Limits
Understand whitespace-based word counts, UTF-16 character counts, paragraph heuristics and reading-time estimates before submitting text to a form or editor.
With Word & Character Counter →Compare Compounding and Monthly Contributions
Model growth of a lump sum and monthly additions, check zero-interest contributions, and understand the tool’s different timing assumptions for each component.
With Compound Interest Calculator →Compare JPG and WebP for a Web Image
Convert a JPEG to WebP, compare measured bytes and visible detail, and understand why a new codec cannot restore missing pixels or guarantee a smaller file.
With JPG to WebP →Compare Loan EMI and Total Interest
Understand fixed-rate EMI assumptions, compare two loan tenures, and separate monthly affordability from total repayment using a worked example.
With EMI Calculator →Compare Text Revisions Line by Line
Review added and removed lines, understand why one edited line can count twice, and recognise whitespace, reordering and large-comparison limitations.
With Text Diff Checker →Convert CSV Without Losing Identifiers
Choose CSV delimiters and header names, control automatic type conversion, and preserve leading zeros and large identifiers when producing JSON.
With CSV to JSON →Convert HEIC Photos for Compatible Sharing
Convert HEIC/HEIF photos to JPEG, inspect orientation and unsupported features, and understand the first-image, metadata and decoder limitations.
With HEIC to JPG →Convert HEX, RGB and HSL Color Values
Inspect HEX and RGB inputs, compare HSL output, and understand rounding, ignored alpha and why colour conversion does not establish accessible contrast.
With Color Converter →Convert JPG to PNG with Realistic Expectations
Convert JPEG pixels into PNG, understand why lost detail and transparency do not return, and check when the larger output is appropriate for another workflow.
With JPG to PNG →Convert JSON Records to CSV Columns
Map JSON object keys to CSV columns, inspect missing and nested values, choose a delimiter, and check spreadsheet interpretation before opening exports.
With JSON to CSV →Convert PDF to Word and Review Editability
Understand text-PDF versus scanned-PDF conversion, inspect reading order and layout, and check that the downloaded DOCX is usable rather than assuming a perfect round trip.
With PDF to Word →Convert Transparent PNG for JPG-Only Uploads
Convert a PNG to real JPEG bytes, inspect the white transparency background and quality tradeoff, and check a receiving form without merely renaming a file.
With PNG to JPG →Convert Units and Check Temperature Offsets
Convert measurements within a category, distinguish US gallons and area factors, and check why Celsius and Fahrenheit need an offset as well as scaling.
With Unit Converter →Convert Unix Seconds, Milliseconds and Time Zones
Distinguish Unix seconds from milliseconds, compare UTC and browser-local time, and understand how local date inputs affect timestamp conversion.
With Unix Timestamp Converter →Convert Word to PDF and Check Layout
Prepare a Word document for PDF conversion, inspect page breaks and fonts, and understand the limits of server rendering for complex office layouts.
With Word to PDF →Count Days Between Dates and Endpoints
Compare elapsed and inclusive calendar-day counts, understand month-end conventions, and check which endpoints a deadline or booking requires.
With Date Difference Calculator →How to Create and Test a Website QR Code
Create a website QR code, choose PNG or SVG, and test its actual destination before sharing or printing. Includes scan troubleshooting and static-link limits.
With QR Code Generator →Encode URL Components Without Breaking Links
Choose component or full-URL encoding, check spaces and literal plus signs, and avoid double encoding or treating percent encoding as sanitisation.
With URL Encoder / Decoder →Encode UTF-8 Text as Base64
Encode and decode text with a UTF-8-safe Base64 workflow. Check padding, whitespace, Base64URL differences and why encoding is not encryption.
With Base64 Encoder / Decoder →Estimate FD Maturity and Compounding
Calculate a hypothetical fixed-deposit maturity, compare compounding frequencies, and understand why tax, payout schedules and bank rules can change proceeds.
With FD Calculator →Export PDF Pages as JPG Images
Choose PDF rendering resolution, understand single-image versus ZIP downloads, and check page count and text readability after raster export.
With PDF to JPG →Export Presentation Slides as PDF
Convert a presentation into static PDF pages, inspect fonts and slide geometry, and understand why animations, video and speaker notes need separate handling.
With PPT to PDF →Extract a Checked Subset of PDF Pages
Select physical PDF page positions, understand sorted and deduplicated output, and check that the extracted document includes exactly the intended content.
With Extract PDF Pages →Extract PDF Tables and Check Spreadsheet Data
Extract detectable PDF tables into worksheets, check string-valued cells and merged headers, and understand the limits for scanned pages and original formulas.
With PDF to Excel →Extract Text from a Clear Document Image
Prepare a readable scan for OCR, choose the correct language, and proofread numbers and layout before copying or downloading recognised text.
With Image to Text / OCR →How to Format JSON and Fix Common Syntax Errors
Format valid JSON, diagnose quotes, commas, and brackets, and copy or download the result. Includes examples and JavaScript numeric-precision limitations.
With JSON Formatter & Validator →Generate Version 4 UUIDs for Test Records
Generate and copy random version 4 UUIDs, inspect their format, and understand collision handling, batch limits and why identifiers are not access control.
With UUID Generator →How to Merge PDF Files Online
Combine PDFs in the right file order, download one document, and check the result. Includes a working merger and help for protected or damaged files.
With Merge PDF →Inspect JWT Claims Without Trusting Them
Decode a JWT header and payload, read timestamp claims, and understand why readable JSON and a not-expired label do not verify a signature or authorisation.
With JWT Decoder →Make a Scanned PDF Searchable and Check It
Add recognised text to scanned pages, distinguish mixed PDFs and force OCR, and test search and copying without assuming an exact reconstruction of the source.
With PDF OCR / Searchable PDF →Make a Static WebP Image Compatible with JPG
Create a JPEG for a destination that rejects WebP, check transparency and static-image behavior, and compare the actual quality and size of the exported file.
With WebP to JPG →Make an Ordered PDF from Photos
Arrange photos into one PDF, choose page size and margins, and check scaling, transparency, page order and readability in the downloaded document.
With JPG to PDF →Plan Annual SIP Contribution Increases
See how annual contribution increases affect a SIP budget. Check a zero-return example and distinguish extra deposits from hypothetical investment gains.
With Step-up SIP Calculator →Prepare Spreadsheet Pages for PDF
Set spreadsheet print areas and orientation before PDF conversion, check clipped columns and sheet order, and distinguish fixed pages from an editable workbook.
With Excel to PDF →Read a QR Code and Check Its Destination
Read a QR image or camera view, inspect decoded text before opening links, and troubleshoot focus, margins and permission errors without trusting a scan alone.
With QR Code Scanner →Reconcile CTC with Fixed Monthly Pay
Separate employer costs, variable pay and employee deductions in a CTC estimate. Check a transparent no-tax example and the fixed-gross tax limitation.
With CTC to In-Hand Salary Calculator →How to Reduce Image Size for Online Forms
Choose dimensions, format, and quality to reduce an image for an upload form. Compare the output and download it using the embedded image compressor.
With Image Compressor →Reduce PDF Size and Check Quality
Choose a PDF compression preset, compare actual bytes and page readability, and understand why some PDFs cannot shrink or retain every interactive feature.
With Compress PDF →Remove a Known PDF Password Safely
Create an unencrypted PDF copy using an authorised known password, check the result, and understand why the tool is not password recovery or document repair.
With Unlock PDF →Resize Images Without Distorting Proportions
Resize by pixels or percentages, understand aspect-ratio locking, and check exact output dimensions without confusing resizing with cropping or byte-size targeting.
With Image Resizer →Save Correct Page Orientation in a PDF
Rotate all or selected PDF pages, distinguish saved rotation from viewer-only rotation, and verify mixed-orientation documents without promising deskew or OCR.
With Rotate PDF →Split a PDF into Separate Document Files
Split one PDF into range-based outputs or individual pages, understand comma-separated groups, and verify page boundaries and browser downloads.
With Split PDF →Test JavaScript Regex with Small Examples
Check JavaScript regular expressions with positive and negative cases, inspect groups and flags, and understand forced global matching and execution limits.
With Regex Tester →Understand SIP Growth and Contribution Timing
Model a regular monthly investment, check contributions at zero return, and understand assumed returns, beginning-of-month timing, fees and inflation.
With SIP Calculator →