Tools starting with L
108 free online tools on AltFTool start with L, listed alphabetically. Every one is free, needs no sign-up and runs in your browser.
Lab Attendance Requirement Tracker
Track practical and lab attendance separately from theory, weight lab sessions by contact hours and see the experiments still pending.
CalculatorsBuild an IMRaD lab report skeleton with word budgets per section, a what-goes-where checklist and a percent error calculator.
Education & ScienceCompare private lab measurements over time.
Security & PrivacySafe ladder base distance, set-up angle, highest standing level and reach height using the OSHA 4-to-1 rule.
CalculatorsEstimate laminate planks, packs, underlay rolls and beading lengths for a room, with a wastage allowance.
CalculatorsLand Area Converter (Indian Units)
Convert bigha, katha, kanal, guntha, cent and acre using the exact value your state actually uses.
CalculatorsDetect the language of any text with a confidence score, script detection, character statistics, and support for mixed-language input.
Education & ScienceLanguage Exchange Session Planner
Plan a balanced tandem session: equal minutes in each language, timed blocks with clock times, and topic cards by level.
Education & ScienceCreate flashcards, organize into categories, practice with spaced repetition, track progress, and import/export flashcard sets.
Education & ScienceSimulated laptop hacking terminal for educational and entertainment purposes.
Security & PrivacyLaptop-Only Desk Posture Fixer
Work out the exact riser height, chair change and neck angle you need when a laptop is your only screen.
Health & FitnessLast Minute Unit Priority Tool
Rank syllabus units by marks recoverable per study hour and get a greedy hour allocation for the time left before the paper.
Education & ScienceWork out late filing fees for income tax returns under Section 234F, belated returns, GST late fee and interest, and late payment fees on invoices.
Finance & BusinessLate Payment Reminder Letter Builder
Build escalating overdue-invoice chase letters, from a polite nudge to a final notice, with the right tone for how late the payment is.
Text & WritingSearch common Latin legal maxims by phrase or meaning, with literal translation, plain-language sense and a worked example.
Education & SciencePlan mowing frequency, cutting height and season workload by grass type, season, shade and lawn care level.
ProductivityGreatest common divisor and least common multiple of two numbers.
CalculatorsWork out lean and fat mass from your body fat percentage, or estimate it with the Boer, James and Hume formulas.
Health & FitnessLeave Application Letter Generator
Build a correctly formatted leave application for school, college or office, with an inclusive day count and a format checklist.
Text & WritingWeighted pre-flight checklist for audio levels, framing, lighting and screen capture before you record a lecture.
Education & ScienceEstimate an LED's PWM flicker pattern from the rolling bands your camera picks up.
DeveloperConvert incandescent, halogen and CFL wattages into the equivalent LED wattage by lumens, with the energy and cost saved per bulb.
ConvertersLeftover Ingredients Recipe Finder
Tick what is left in your fridge and get real dishes you can cook tonight, plus ones you are one item away from.
LifestyleLegal Deadline Countdown Board
Track every legal deadline on one board with calendar days, working days remaining and colour-coded reminder bands.
ProductivityLegal Document Version Log Builder
Build a numbered revision history for a contract or pleading with reviewers, dates, turnaround gaps and a paste-ready log.
ProductivityLegal Glossary Flashcard Builder
Turn legal terms into simple flashcards with plain-English meaning, example usage and revision prompts.
PDF & DocumentsEstimate the full cost of sending a legal notice: drafting fee, GST, stamp paper, notarisation, printing, dispatch and follow-up reminders.
Finance & BusinessTrack notice dispatch mode, tracking IDs and delivery dates, and get the reply deadline and next-step date for each notice.
ProductivityPlan a physical Leitner flashcard system: box intervals, a day-by-day review calendar, daily card load and minutes needed.
Education & ScienceInteractive geometric optics ray diagram generator for convex/concave lenses and spherical mirrors with real-time magnification and image tracking.
Education & ScienceCalculate camera field of view, crop factors, scene coverage, and compare lenses in real-time.
Image & VideoTune optical letter-spacing per font size, weight and case, with a live preview and copyable em, px and 1/1000 em values.
Design & ColorLetterbox Pillarbox Calculator
Work out exact letterbox or pillarbox bar sizes when fitting one aspect ratio inside another frame, in pixels and percent.
CalculatorsGenerate per-language license header comments with year, copyright holder and SPDX identifier for 9 common licenses.
GeneratorsCalculate your life productivity score
ProductivityDiscover your life in numbers — heartbeats, breaths, dreams, and more. Enter your birth date to reveal the hidden statistics of your existence.
FunInteractive Snell's Law light refraction simulator with material refractive index controls, critical angle detection, and Total Internal Reflection.
Education & ScienceJoin multi-line text into one line with your chosen separator.
Text & WritingCalculate a comfortable line height from font size and measure width, with characters per line and WCAG checks.
Design & ColorAdd sequential line numbers to every line of your text.
Text & WritingColour-codes the scheme, userinfo, host, port, path and query of any URL and flags the parts phishing links abuse.
Security & PrivacyGroup, save, and bulk-open your daily links and resources.
ProductivityGenerate instant rich link previews with detailed metadata.
Design & ColorShorten a long URL into a compact, shareable link and keep the last few to hand
DeveloperGenerate LinkedIn headline options combining role, value and proof, checked against the 220-character limit and search truncation.
Marketing & SocialLinkedIn Profile Photo Generator
Create a professional LinkedIn profile photo with customizable borders, overlays, filters, and backgrounds — all in real-time.
Design & ColorLinux Common Command Query Tool
Live Linux command query studio with searchable syntax, examples, favorites, history, and cheat sheet exports.
DeveloperPractice lip reading with a zoomed webcam view of the mouth and slow replay.
DeveloperComplete lipid panel analysis with NCEP ATP III classification, cardiovascular risk scoring, risk factor integration, and personalized treatment recommendations.
Health & FitnessLiquid Medicine Measuring Guide
Turn a prescribed dose into millilitres, the right oral syringe size and the exact marking to fill to.
Health & FitnessGenerate elegant frequency-based mathematical curves and oscilloscope-style Lissajous patterns.
CalculatorsSort list items alphabetically, numerically, by text length, or reverse with options for custom list separators.
Text & WritingCheck product images and captions against Amazon, Flipkart, Meesho, Etsy, Shopify, Facebook ad, Instagram caption and TikTok caption rules before you upload.
Marketing & SocialConvert fuel and liquid volumes between litres, US gallons, imperial gallons, quarts and millilitres, with price per unit.
ConvertersShow adjustable live captions using your browser's own speech engine.
DeveloperAnalyze AI usage logs locally with user-supplied token rates, model cost summaries, and counts-only personal-data or secret signals.
AI ToolsA-Z dictionary of LLM terms — tokens, temperature, top-p, RAG, LoRA — with examples, typical values and a context budget check.
Education & ScienceLoan Against Fixed Deposit Calculator
Compare breaking a fixed deposit early against borrowing an overdraft on it, using the premature penalty and the FD rate plus spread.
Finance & BusinessLoan Against Property Calculator
Check loan against property eligibility from property value and LTV, then test it against income-based EMI affordability and FOIR.
Finance & BusinessLoan App Permission Risk Auditor
Review an Android manifest or permission list locally and understand sensitive access patterns often relevant to abusive loan-app behavior.
Security & PrivacyMonthly payment, total interest and total cost of a loan.
Finance & BusinessCheck the loan amount you qualify for from your income, existing EMIs and the FOIR limit lenders apply, with a tenure comparison.
Finance & BusinessLoan Eligibility from Salary Calculator
Maximum loan you can get from take-home salary using common FOIR bands, plus the RBI loan-to-value ceiling on housing loans.
Finance & BusinessLoan EMI Calculator helps you calculate the monthly EMI of a loan.
Finance & BusinessExtract fees, penalties, reset clauses and hidden charges from a loan agreement.
Finance & BusinessCompare your loan with and without prepayments. See how extra payments reduce your tenure and total interest paid.
Finance & BusinessLoan Prepayment vs Investment Analyzer
Should you prepay your loan or invest the money? See interest saved vs wealth gained, break-even return, and a clear verdict.
Finance & BusinessReview a HAR network trace locally to see which hosts an AI app contacted and where outbound bodies, credential headers, or sensitive query names appeared.
Security & PrivacyCompare manually entered computer specifications with transparent local-AI workload thresholds without scanning the device or recommending a specific model.
AI ToolsLocal Cuisine Bucket List Builder
Build a must-eat list for a destination, check it against the eating slots your trip actually has, and tick dishes off as you go.
LifestyleLocal Festival Day Trip Planner
Time a festival day backwards from the gates: queue build-up, arrival buffer, crowd density, exit clear time and the last service home.
LifestyleLog loud sound events to a timestamped timeline kept on your own device.
DeveloperView, manage, add, edit, and delete browser LocalStorage keys and values in real-time.
DeveloperRemove or coarsen sensitive places and timestamps in JSON, CSV and GeoJSON location history entirely in your browser.
Security & PrivacyRecord a location with real sun direction, golden hour times and a weighted score for noise, power, access and permission.
ProductivityLocker Rent and Insurance Cost Estimator
Work out annual bank locker rent with GST, the term deposit blocked as security, and the gap between RBI's liability cap and your contents.
Finance & BusinessCalculate log base 10, ln, log2 or any base, find antilogs, solve b^x = y for x, and see exact values and change-of-base steps with a graph.
CalculatorsDecide whether an event belongs at trace, debug, info, warn, error or fatal, plus per-environment minimum levels.
DeveloperDesign and simulate interactive digital logic circuits with AND, OR, NOT, NAND, NOR, XOR, and XNOR gates. Build, test, analyze truth tables, and optimize boolean logic using Karnaugh maps.
Education & ScienceCreate memorable slogans and catchy logo concepts for your brand.
Finance & BusinessLogo Animation Storyboard Builder
Split a logo sting into weighted beats and get frame-accurate in and out points, timecodes and easing curves for your editor.
Design & ColorLogo Favicon Legibility Checker
Check whether a logo's strokes and lettering survive at 16, 32, 48 and 180 pixel favicon sizes, with real downscaled previews.
Design & ColorTest a logo colour against light, dark and photographic backgrounds using WCAG contrast ratios, and get the scrim opacity that fixes it.
Design & ColorBuild an AI logo prompt from mark type, shape language and palette, with stroke, clear-space and favicon limits computed for you.
Design & ColorCompare two logos using algorithm-powered visual analysis. Analyze shape, color, layout, and typography similarity entirely in your browser.
Design & ColorDo long division step by step, laid out like on paper, with quotient and remainder, decimals to 20 places and repeating decimals like 0.(142857).
CalculatorsLong Study Session Stretch Guide
Desk stretches scheduled across a long study day — rotating neck, shoulder, wrist and back sets with timing cues.
Health & FitnessFind every long weekend of the year and the exact leaves to apply for, so a handful of days off buys you weeks of holiday.
LifestyleConvert loop lengths between bars, beats, seconds and samples at any tempo, with a note-division delay table.
CalculatorsGenerate clean placeholder copy by paragraphs, sentences, or words.
Design & ColorConverts audio files between WAV, FLAC, MP3 and OGG formats.
Image & VideoPrioritize the account-security steps to take in the first hour after losing a phone.
Security & PrivacyLoudness & True-Peak Normalizer
Normalize audio loudness with LUFS, true-peak and clipping analysis.
Image & VideoCalculate compatibility and relationship potential between two names using name matching algorithms.
LifestyleFree photo love test for couples, crushes and friends: two photos, a couple selfie or a group. Mood, face ratios and resemblance measured on your device.
Image & VideoDraft a romantic poem from relationship notes, memories, tone, occasion and message length.
Text & WritingTurn GPU triangle throughput and a target frame rate into per-asset triangle budgets, LOD chains and buffer memory.
CalculatorsMagnify what your camera sees with zoom, invert, contrast and grayscale modes.
DeveloperLoyalty Program Data Explainer
See what supermarket and airline loyalty records infer about your household, and which inferences are special-category data.
Security & PrivacyEstimate how many days an LPG cylinder lasts from your daily burner hours, plus gas cost per day and the date to book the refill.
CalculatorsLPG Subsidy and Ujjwala Benefit Checker
Work out the cost of an LPG cylinder after the Ujjwala subsidy, the 12-refill annual cap and your yearly cooking gas bill.
Finance & BusinessUpload a photo and discover your fictional luck score with fun badges and fortune!
FunFair lucky number generator: quick picks for 16 lottery games with exact odds, a lottery lab (checker, odds, wheel, simulator), numerology, zodiac and custom draws.
FunPlay classic Ludo with friends locally or challenge the AI. Features smart AI, 3D dice, themes, and full statistics.
GamesSplit luggage weight across travelers and bags, check airline limits, balance items, and export a clean packing weight plan.
LifestyleCalculate the future value of your one-time lumpsum investment with compound growth projections and detailed year-by-year breakdown.
Finance & BusinessLuteal Phase Length Calculator
Work out luteal phase length from your ovulation date and the next period start date, with follicular and cycle length too.
Health & FitnessSplit pasted lyrics into karaoke-friendly lines with a character-per-line limit, stanza breaks and minimum on-screen time.
Text & Writing