Tools starting with O
38 free online tools on AltFTool start with O, listed alphabetically. Every one is free, needs no sign-up and runs in your browser.
Translate requested OAuth permissions into plain-language risk levels.
Security & PrivacyBuild a pre-live checklist for scenes, audio, sources and alerts, with the bitrate and upload headroom your stream needs.
ProductivityWrite heartfelt messages for anniversaries, retirement, exam good luck, get well soon, condolence, Mother's Day, Father's Day, Teachers' Day and Women's Day.
GeneratorsTrack important occasions with smart reminders, recurrence rules, and action-ready schedules.
ProductivityOffice Leave Application Generator
Draft casual, earned, sick or emergency leave letters with a handover plan, notice check and running leave balance.
Text & WritingInspect bounded local Office packages for VBA part, relationship, content-type, and legacy-container cues without opening or executing macros.
Security & PrivacyCompare a contact from a message with an independently obtained official reference, locally and without claiming live registration or authenticity.
Security & PrivacyWrap share-card headlines with real Helvetica metrics, check they fit the safe area and stay legible at feed thumbnail size.
Marketing & SocialEnter any two of voltage, current and resistance to find the third — plus power.
Education & SciencePlan your next engine oil change from oil type, driving conditions and kilometres run, with severe-service adjustment.
ProductivityGenerate objectives with measurable key results and suggested initiatives using AI-style prompts.
ProductivityTrack dormant account deletion requests with real response deadlines under GDPR and CCPA, overdue flags and proof references.
Security & PrivacyOld Phone Resale Wipe Checklist
The correct order to back up, migrate, sign out and factory reset a phone before selling it — and a warning when you tick a step too early.
Security & PrivacyBreathe new life into vintage, grainy, sepia-toned, or scratched photographs with AI restoration logic.
AI ToolsCalculate your daily EPA+DHA Omega-3 intake from fish, seeds, walnuts, and supplements and see if you're meeting recommended health guidelines.
Health & FitnessPlan how many exam minutes to reserve for transferring answers to the OMR sheet, with batch strategies and a stop-solving clock mark.
Education & ScienceCalculate your estimated one-rep max weight using scientific formulas. Track your fitness progress with multiple calculation methods.
Health & FitnessMultiple-choice drill on 80 exam one-word substitutions, with same-family distractors and the Greek or Latin root behind every answer.
Education & SciencePractice single-handed keyboard layouts with typing exercises built for one hand.
DeveloperWrite HTML, CSS, and JavaScript in a powerful Monaco editor and preview the result live in a sandboxed iframe. Templates, projects, console, and more.
DeveloperKeep perfect time with a precise online metronome — tap tempo, time signatures, subdivisions, and accented beats.
Image & VideoWrite, autosave, export, and clear quick notes in your browser.
Design & ColorPlay a virtual piano with your mouse, touch screen or computer keyboard: four instruments, sustain pedal, metronome and melody recording to WAV.
FunActual-size on-screen ruler in centimetres, millimetres and inches, calibrated with a bank card, coin or screen size, with a draggable caliper.
ProductivityFree online scoreboard for 2–8 teams with a game clock, basketball, cricket, badminton and table tennis rules, undo, history and a full-screen display.
ProductivityAccurate online stopwatch with laps, keyboard shortcuts, and fastest/slowest lap analysis.
ProductivityPlay pure sine, square, sawtooth or triangle tones from 1 Hz to 22 kHz, mix up to four, run frequency sweeps and binaural beats.
Image & VideoRecord your voice from any microphone with pause, live waveform and level meter, then trim, rename and download as WebM, M4A or WAV.
Image & VideoAnswer a few questions to pick between MIT, Apache-2.0, MPL-2.0, LGPL, GPL, AGPL and public-domain licenses.
Finance & BusinessScore your daily oral care habits out of 100 against dental guidance and get ranked, informational tips on what to fix first.
Health & FitnessOrgan Donation Information Checklist
Work through registration steps and the family conversation for organ donation, with the opt-in or opt-out rule that applies where you live.
Health & FitnessSachet-to-water ratios, homemade sugar-salt proportions and WHO replacement volumes for oral rehydration solution.
Health & FitnessOut of Office Message Generator
Generate an out-of-office auto-reply with exact dates, working days away, return date, backup contact and escalation path.
Finance & BusinessPlan daily daylight minutes against the 2 hours a day and 11 hours a week outdoor targets used in myopia research, with a lux-hour estimate.
Health & FitnessConvert oven temperatures between Celsius, Fahrenheit, gas marks and fan settings with a full reference chart.
LifestyleCalculate overtime pay from hourly rate, regular hours, overtime hours and multiplier with weekly totals.
Finance & BusinessSee your ovulation day, fertile window, and best days to conceive for the next six cycles on a clear calendar.
Health & FitnessCalculate oxygen requirements including flow rates, FiO2, and delivery device selection based on patient parameters and SpO2 targets.
Health & Fitness