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Tools starting with I

118 free online tools on AltFTool start with I, listed alphabetically. Every one is free, needs no sign-up and runs in your browser.

  • ICC Profile Explainer

    Compare working space gamuts, see what assigning the wrong profile does to each primary, and learn when to convert instead.

    Education & Science
  • Icon Maker Tool

    Create, preview, copy, and export production-ready app icons, favicons, launcher assets, and PWA icons in the browser.

    Design & Color
  • Icon Naming Consistency Checker

    Audit a list of icon file names against kebab, snake, camel or Pascal case, catch duplicates and reserved names, and get corrected names.

    Developer
  • Ideal Body Measurements Calculator

    Classic proportion targets for chest, waist, arms, thighs and calves scaled from your wrist using McCallum and Steve Reeves ratios.

    Health & Fitness
  • Ideal Gas Law Calculator

    Solve for pressure, volume, amount, or temperature in the ideal gas law (PV = nRT) with automatic unit conversion.

    Education & Science
  • Ideal Weight Calculator

    Compare Devine, Robinson, Miller and Hamwi ideal weights, and get a healthy range tuned to your frame size and height.

    Health & Fitness
  • Identity-Minimizing DSAR Planner

    Plan the minimum identity proof needed to verify a privacy request.

    Security & Privacy
  • Idiom Explorer

    Search, explore, and learn English idioms with meanings, examples, origins, and quiz mode.

    Education & Science
  • Idling Fuel Waste Calculator

    Work out the fuel, money and CO2 wasted idling at signals and in traffic, and how much switching off would save.

    Calculators
  • IELTS Band Score Calculator

    Convert IELTS Listening and Reading raw scores to bands and compute the Overall Band Score with the official rounding rules.

    Calculators
  • IELTS Speaking Practice Timer

    Time IELTS Speaking Parts 1-3 to the real format - 1 minute cue card prep, 2 minute long turn - with practice cue cards included.

    Productivity
  • IELTS Writing Task Word Counter

    Count words against the IELTS Task 1 (150) and Task 2 (250) minimums with paragraph and sentence structure analysis.

    Text & Writing
  • Illegal Entry Objection Letter

    Log landlord entries, test each against the 24-hour notice and 7 am to 8 pm rules, and draft a dated objection letter.

    Finance & Business
  • Image Collage Maker

    Create beautiful photo collages from your images with customizable layouts and spacings.

    Image & Video
  • Image Compressor

    Compress images instantly and reduce file size efficiently.

    Image & Video
  • Image Converter

    Batch convert images between JPG, PNG, WebP, AVIF, BMP, GIF and ICO in your browser, with quality, resize, background fill and ZIP download.

    Image & Video
  • Image Credit Line Generator

    Build consistent photo credit lines in wire, magazine, caption and museum styles, plus the matching IPTC metadata fields.

    Finance & Business
  • Image Cropper

    Crop your image according to your needs

    Image & Video
  • Image Editor

    Adjust brightness, saturation, inversion, grayscale, rotation, and flip on your images.

    Image & Video
  • Image ELA Forensics Viewer

    Explore local JPEG re-encoding residuals with a gain-adjusted heatmap, bounded statistics, and regional measurements without uploading the image or producing an authenticity verdict.

    Image & Video
  • Image File Size Budget Calculator

    Set a page weight budget, subtract code and fonts, and see how many images of a given size and format still fit.

    Calculators
  • Image Flip & Rotate Tool

    Flip, mirror, rotate, straighten, preview, and export images in browser with batch ZIP downloads.

    Image & Video
  • Image Format Converter For Forms

    Convert photos and signatures between JPG, JPEG and PNG in the browser, with the exact extension and size portals demand.

    Converters
  • Image Generation Credit Planner

    Plan how many images a credit pack yields, how long it lasts at your volume, and the real cost per image.

    Calculators
  • Image Metadata Viewer

    Extract and view complete image metadata including EXIF, IPTC, GPS, and file properties.

    Design & Color
  • Image Noise & Grain Adder

    Add realistic film grain, vintage noise, and cinematic textures to your photos.

    Image & Video
  • Image Quality Checker

    Analyze image quality with nine professional metrics including sharpness, brightness, contrast, noise, exposure, and histogram analysis.

    AI Tools
  • Image Resizer

    Resize images with custom dimensions, social media presets, fit/crop modes, batch processing, and format export.

    Image & Video
  • Image Resolution Compare

    Compare image resolution, quality, sharpness, DPI, and compression like a professional. Analyze two images side-by-side with detailed metrics.

    Design & Color
  • Image Reverse Search Planner

    Plan a reverse-image audit of your profile photos: which engines can answer your question, which crops to submit, how long it takes.

    Security & Privacy
  • Image to Base64

    Convert uploaded images into Base64 data URLs for quick embedding.

    Developer
  • Image to PDF Converter

    Convert JPG, PNG, and other image formats to high-quality PDF documents. Drag and drop your images to create professional PDFs instantly.

    PDF & Documents
  • Image to Video Tool

    Convert images into engaging videos quickly and easily.

    AI Tools
  • Image Usage Rights Explainer

    Answer six questions about an image and get a plain-language checklist of the copyright, licence, model release and trademark clearances your use needs.

    Finance & Business
  • Impossible Object Builder

    Generate a Penrose triangle, impossible rectangle or endless staircase as an SVG, and tune the camera angle to see exactly why the illusion holds — or breaks.

    Design & Color
  • Improvement Needed Calculator

    Compute exactly how many more marks you need in remaining exams to reach a target overall percentage, and whether it is still possible.

    Calculators
  • Inattentional Blindness Test

    Experience the famous Gorilla Experiment — test your awareness, see if you spot the unexpected, and share your results.

    Education & Science
  • Inches to Centimetres Bag Converter

    Convert bag dimensions between inches and centimetres and check them against a cabin or checked baggage allowance.

    Converters
  • Incident Severity Matrix Builder

    Define SEV levels with impact, response targets and escalation paths, and export a ready-to-publish Markdown severity matrix.

    Finance & Business
  • Income Certificate Income Calculator

    Aggregate family income the way EWS, OBC non-creamy-layer and state income certificate applications actually require, with the asset tests.

    Finance & Business
  • Income Tax Calculator

    Compare India old and new tax regimes with deductions, rebate, surcharge, cess, and slab-wise breakup.

    Finance & Business
  • Income Tax Notice Type Explainer

    Understand what an income tax notice under section 139(9), 143(1), 143(2), 148 or 245 means, how long you have to reply and what to do next.

    Education & Science
  • Income Tax Slab Visualizer

    See exactly how much tax each slab contributes to your total bill, old regime vs new regime, with surcharge and cess.

    Finance & Business
  • India Import Duty & Landed Cost Calculator

    Work out the landed cost of bringing goods into India by courier or in baggage — CIF, BCD, Social Welfare Surcharge, IGST and the flat 38.5% baggage rate, line by line.

    Finance & Business
  • Indian Code Decoder

    Decode what an Indian vehicle number plate, registration, driving licence number, PAN, IFSC or cheque MICR code says: state, RTO, holder type, bank and branch.

    Finance & Business
  • Indian English Loanword Finder

    Trace 61 everyday English words back to Sanskrit, Hindi, Urdu, Tamil, Malayalam, Telugu, Marathi, Bengali and Odia, with the route, era and how settled each etymology is.

    Education & Science
  • Indian Festival Colour Palette Generator

    Palettes for Diwali, Holi, Onam, Pongal and Durga Puja creatives with tint ramps and WCAG contrast checks.

    Design & Color
  • Indian Festival Greeting Card Maker

    Make Diwali, Eid, Pongal, Onam and other festival cards with regional motifs and greetings in 11 Indian languages.

    Design & Color
  • Indian Heritage Monument Explorer

    Browse and filter Indian heritage monuments by state, historical era, architectural style and UNESCO World Heritage status.

    Education & Science
  • Indian Holiday Finder

    Find Indian public holidays, festivals, bank weekends, long weekends, and state-wise holiday planning windows.

    Lifestyle
  • Indian ID Format Validator

    Check whether a PAN, GSTIN, TAN, IFSC code, voter ID, vehicle number plate or roll number is in a valid format, with the reason when it is not.

    Finance & Business
  • Indian Marks To UK Class

    Convert an Indian degree percentage into the UK First, 2:1, 2:2 and Third class equivalents UK universities use for admissions.

    Calculators
  • Indian Mobile Number Validator

    Run country code and numbering-series sanity checks on an Indian mobile number.

    Lifestyle
  • Indian Number Format Converter

    Convert between lakh-crore and million-billion notation, with Indian 2-2-3 and international 3-3-3 digit grouping.

    Converters
  • Indian Percentage To US GPA

    Convert an Indian percentage or 10-point CGPA to the US 4.0 GPA scale using the division-based method and a linear estimate.

    Calculators
  • Indian Print Paper Size Guide

    Look up A-series, legal, foolscap, SRA and Indian trade sheet sizes in mm, inches, points and pixels, with an ups-per-sheet check.

    Design & Color
  • Indian Proverb Explorer

    Explore proverbs in Bengali (probad), Kannada (gaade), Marathi (mhani), Punjabi (akhaan), Tamil (palamozhi) and Telugu (samethalu) with meanings in English.

    Education & Science
  • Indian Street Food Calorie Guide

    Calorie and macro estimates for pani puri, vada pav, chaat, rolls and momos, with plate totals and share of your daily target.

    Health & Fitness
  • Indian Wedding Hashtag Generator

    Blend both partners' names into wedding hashtags — portmanteaus, shaadi puns and classic formats — each length-checked for Instagram.

    Marketing & Social
  • Indirect Prompt Injection Scanner

    Scan pasted HTML, Markdown, CSV, or text locally for hidden instructions, role markers, data-exfiltration requests, and prompt-injection signals.

    Security & Privacy
  • Indoor Humidity Comfort Guide

    Find your target indoor humidity range, dew point, mould and condensation risk, and the water to add or remove.

    Health & Fitness
  • Inflation Adjusted Return Calculator

    Convert nominal returns into real, inflation-adjusted returns over any period and see what your money is truly worth.

    Finance & Business
  • Inflation Purchasing Power Calculator

    See what inflation does to your money — future costs, shrinking purchasing power, and the return you need to beat it.

    Finance & Business
  • Inflation Time Machine India

    Convert a rupee amount between any two years using India's official CPI inflation series, with the purchasing power lost in between.

    Education & Science
  • Influencer Disclosure Label Generator

    Build a compliant paid-partnership disclosure for each platform and content type, with placement rules and on-screen duration.

    Marketing & Social
  • Influencer Engagement Rate Calculator

    Work out engagement rate by followers, by reach and by impressions from real post totals, with creator tier and quality bands.

    Calculators
  • Influencer Media Kit Builder

    Build a professional media-kit PDF from your creator metrics and audience data.

    Marketing & Social
  • Ingredient Substitute Finder

    Find instant ingredient replacements with precise ratios and dietary filters.

    Lifestyle
  • Inhaler Technique Checklist

    Step-by-step technique checks for pMDI, spacer, dry powder, soft mist and breath-actuated inhalers.

    Health & Fitness
  • INI to YAML Converter

    Convert INI configuration files to structured YAML with dotted sections nested and value types inferred.

    Converters
  • Insect Tracker

    Catch butterflies, bees, ladybugs and more in this fast, fun insect-tracking arcade game. Beat your high score across rising difficulty levels.

    Games
  • Instagram Carousel Planner

    Plan carousel slide order, hooks and swipe pacing, with projected swipe-through retention and read time per slide.

    Marketing & Social
  • Instagram DP Enhancer

    Enhance your Instagram display picture with vibrant gradient borders, filters, and effects — download-ready in 1080x1080.

    Design & Color
  • Insurance Cover Calculator

    Work out how much term life, health and personal accident cover you need from income, family, loans and city.

    Finance & Business
  • Insurance Policy Comparator

    Compare insurance policies on coverage, exclusions, waiting periods and limits.

    Finance & Business
  • Insurance Policy Renewal Tracker

    Track every policy number, sum insured and renewal date in one place, with annualised premium, grace period and lapse dates.

    Finance & Business
  • Interactive Seating Chart Maker

    Design seating arrangements for weddings, classrooms, and banquets with table layouts and attendee dragging.

    Lifestyle
  • Interior Design Prompt Generator

    Turn a room, style and budget feel into an AI image prompt, with lighting lumens and rug size computed from your room dimensions.

    Lifestyle
  • Intermittent Fasting Timer

    Track your fasting window live, see the metabolic phase you are in, and log every fast with streaks.

    Health & Fitness
  • Internal Marks Calculator

    Compute your internal assessment marks from tests, assignments and attendance using your university's component weightings.

    Calculators
  • International Call Cost Calculator

    Compare roaming per-minute, local SIM, VoIP-over-data and calling-pack pricing for calls home during a trip.

    Productivity
  • International Driving Permit Checker

    Check whether you need an International Driving Permit to drive in the USA, UK, UAE, Australia, Canada, New Zealand, Japan, Germany, France or Italy with an Indian licence.

    Lifestyle
  • Internet Speed Test

    Get fast and accurate speed test results for your network.

    Developer
  • Interval Ear Trainer

    Practice melodic and harmonic intervals with an interactive browser-based ear training quiz.

    Image & Video
  • Interview Consent Form Builder

    Generate a plain-language interview recording consent form covering purpose, usage, retention and the right to withdraw.

    Finance & Business
  • Interview Question

    Find interview questions for your interview preparation

    Education & Science
  • Interview Weightage Calculator

    Combine written and interview marks under the official weightage of UPSC, IBPS or SBI and see exactly how much the interview can move your merit.

    Calculators
  • Intro Music Level Calculator

    Work out how many decibels to duck an intro music bed under a voiceover, and what the mixed level lands at.

    Calculators
  • Inverter & Battery Backup Calculator

    Size your home inverter VA and battery Ah from your real appliance load, with backup and charging time.

    Calculators
  • Inverter AC Payback Calculator

    Work out how many years an inverter AC takes to repay its price premium over a fixed-speed unit, using ISEER and your tariff.

    Finance & Business
  • Inverter Backup Time Calculator

    Estimate home inverter backup hours from battery Ah, bank voltage, connected load and inverter efficiency, with Peukert correction.

    Calculators
  • Investment Comparison Tool

    Compare lumpsum vs SIP, direct vs regular mutual fund plans, cumulative vs non-cumulative FD, digital vs physical gold, UPS vs NPS, simple vs compound interest, flat vs reducing rates and 80TTA vs 80TTB.

    Finance & Business
  • Investment Fee Impact Calculator

    See how expense ratios, management fees, and transaction costs eat into your investment returns over time.

    Finance & Business
  • Investor Risk Profile Quiz

    A practical crypto / invest tool for managing investor risk profile quiz workflows efficiently.

    Finance & Business
  • Invisible Character Generator

    Generate invisible Unicode characters like zero-width spaces and joiners. Copy with one click for use in bios, usernames, and more.

    Text & Writing
  • Invoice Fraud Change Inspector

    Compare observable invoice fields and payment details locally, confirm extracted values manually, and review changes without treating them as proof of fraud.

    Security & Privacy
  • Invoice Generator

    Create clean invoices with line items, tax, discount, totals, and print-ready output.

    Finance & Business
  • Invoice Number Generator

    Generate sequential or date-based invoice numbering schemes in bulk, with prefixes, padding and period resets.

    Generators
  • Invoice-to-Time-Log Reconciler

    Surface mismatches between your billable hours and the invoice line items.

    Finance & Business
  • IOU Letter Generator

    Draft an acknowledgement of debt with the amount in words, simple interest to the due date and the limitation expiry.

    Finance & Business
  • IP Address Checker

    Check if an IP address is valid or not

    Developer
  • IP Address to Number

    Convert IP address to number. The online tool to convert IP address to number can quickly convert IP address to digital format.

    Developer
  • IP Geolocation Lookup

    Look up an IP address's approximate location, ISP, ASN, timezone and map links.

    Developer
  • IP Range Overlap Checker

    Check whether CIDR blocks or IP ranges overlap before VPC peering, VPN setup or merging networks.

    Developer
  • IPA to Text Helper

    Paste IPA notation and get the most likely English word(s), with multiple candidate suggestions and validation for malformed input.

    Education & Science
  • IPv6 Expander

    Expand a shortened IPv6 address to its full form.

    Developer
  • IQ Style Mini Quiz

    Challenge your brain with an IQ-style mini quiz featuring logical reasoning, pattern recognition, memory, and problem-solving questions across multiple difficulty levels.

    Education & Science
  • Iron Intake Calculator For Women

    Daily iron target from age, life stage, diet type and menstrual blood loss, using the IOM dietary reference intakes.

    Health & Fitness
  • Is That Planet Retrograde Right Now

    Live retrograde status for all eight planets, with station-retrograde and station-direct dates plus both shadow windows, computed from the ephemeris.

    Education & Science
  • Ishihara Color Blind Test

    A professional accessibility-focused color vision deficiency screening experience.

    Health & Fitness
  • IsItDown Now

    Check whether a website is down globally or only on your own network.

    Developer
  • ISO 8601 Formatter

    Convert a date/time to ISO-8601 and other formats.

    Developer
  • ISS Pass Finder

    Calculate the next visible International Space Station flyover for your location.

    Developer
  • Itinerary Builder

    Build a day-wise travel itinerary with time slots, activities, costs, conflicts, pace, and export-ready plans.

    Lifestyle
  • ITR Document Checklist Builder

    Build a personalised list of the documents you need to file your income tax return, based on your income sources and deductions.

    Finance & Business
  • ITR Form Applicability Checker

    Answer a few questions about your income to see whether ITR-2 or ITR-3 applies to you and why.

    Finance & Business
  • ITR-U Eligibility Gate & Cost Calculator

    Check the section 139(8A) bars that block an updated return, then price it: the deadline, the section 140B additional tax slab and the total rupee cost.

    Finance & Business
  • IVF Due Date Calculator

    Due date from an IVF embryo transfer or egg retrieval date, with the day-3, day-5 and day-6 transfer offsets and a milestone timeline.

    Health & Fitness