Your files stay with you.
Our tools process your files in your browser, without uploading them to us.
YOUR EVERYDAY TOOLBOX
One less thing
on your list.
Free tools for the files, fixes and little tasks
standing between you and the rest of your day.
Free to useNo account needed
THE TOOLBOX
A tool for that.
82 tools. One less workaround.
Filters
Review labels describe recorded checks, not ratings or a guarantee. Real-device verification remains outstanding.
Design
Explore depth of field
Move the aperture, lens and focus. See your shot change.
Live illustration · calculated focus limits
Travel
Compare passport access
A source-backed map, with its gaps clearly shown.
199 passports · compare or combine · dated sources
Images
Resize images
Get your photos into shape. One image or a whole batch.
JPEG / PNG → JPEG / PNG / WebP
Data
Compare CSV files
See added, removed and changed records at a glance.
Match rows by your chosen ID
Video
Trim a video
Keep the part you need. Leave the rest behind.
MP4 / WebM · browser codec support
Writing
Count words
Words, characters and reading time. All in one place.
Text → counts & reading estimate
Coding
Format JSON
Make tangled JSON readable. Check its syntax, too.
Format / validate / compact
Design
Check color contrast
See whether your text and background work together.
Two colors → WCAG contrast results
Utilities
Convert units
Find the right measure, with the calculation shown.
Length / area / volume / temperature
Data
CSV duplicate checker
Find repeated IDs and blank keys in one CSV. Download the records that need a look.
Runs in your browser · Free
Data
CSV column mapper
Put a CSV in the shape you need. Choose columns, rename headers and change the order.
Runs in your browser · Free
Data
CSV ↔ JSON converter
Switch between CSV and flat JSON records. Keep long IDs and number literals intact.
Runs in your browser · Free
Writing
Line-list cleaner
Turn a messy list into a useful one. Trim, deduplicate, sort and download.
Runs in your browser · Free
Data
CSV merger
Merge matching CSV files or keep their combined columns. Review and download one cleanly structured file.
Runs in your browser · Free
Data
CSV splitter
Split a CSV into smaller files or separate groups, with a header in every part and one ZIP download.
Runs in your browser · Free
Data
CSV row filter
Filter CSV records without writing a formula. Preview the matches and download the complete result.
Runs in your browser · Free
Data
CSV rule checker
Reuse your column checks with portable rule files, then download a report of records that need attention.
Runs in your browser · Free
Data
CSV group summary
Summarize a numeric CSV column by category or across the whole file, with explicit blank and invalid-value handling.
Runs in your browser · Free
Data
CSV column profiler
Inspect a CSV before working with it. Download a column-by-column profile without changing your data.
Runs in your browser · Free
Writing
Text comparison
See added, removed and unchanged lines, with original line numbers and a complete comparison report.
Runs in your browser · Free
Coding
URL inspector & UTM builder
Inspect URL components and repeated parameters. Add or update UTM campaign tags while keeping the rest of the address.
Runs in your browser · Free
Coding
File checksum verifier
Hash a file or UTF-8 text on your device. Check an expected SHA-256 value and download the result.
Runs in your browser · Free
Design
Aspect-ratio planner
Visualize a ratio and calculate a missing dimension, with exact fractions and whole-pixel rounding made visible.
Runs in your browser · Free
Math
Exact fraction calculator
Calculate with exact fractions, see the arithmetic steps and compare a mixed number with its decimal approximation.
Runs in your browser · Free
Planning
Count business days
Plan dates around your working week and holidays.
Choose weekdays & enter holidays
Food
Recipe scaler
Resize a recipe with exact mixed numbers, unchanged notes and a readable text download.
Runs in your browser · Free
Utilities
Room paint estimator
Calculate wall and optional ceiling area, deduct openings and round up to whole paint containers.
Runs in your browser · Free
Energy
Appliance energy cost
Plan appliance kWh and cost, including optional standby power, cycling and multiple appliances.
Runs in your browser · Free
Audio
Sine-tone WAV generator
Create a short, quiet sine tone as a downloadable WAV.
Runs in your browser · Free
Audio
PCM WAV trimmer
Keep a time range from a 16-bit PCM WAV without re-encoding its samples.
Runs in your browser · Free
Language
International Morse translator
Translate letters and digits to Morse, or decode space-separated Morse.
Runs in your browser · Free
Language
Spelling alphabet encoder
Spell names and codes with the ICAO letter alphabet.
Runs in your browser · Free
Networking
IPv4 CIDR subnet calculator
Find a subnet’s mask, address range and conventional host count.
Runs in your browser · Free
Networking
IPv6 hex formatter
Expand or shorten a hexadecimal IPv6 address with consistent formatting.
Runs in your browser · Free
Engineering
Resistor color-code decoder
Read a conventional 4-, 5- or 6-band axial resistor code.
Runs in your browser · Free
Engineering
DC LED series-resistor planner
Choose an E12 or E24 series resistor from nominal low-voltage DC inputs.
Runs in your browser · Free
Fun
Dice roller
Roll up to 20 dice, with 2–1,000 sides each.
Runs in your browser · Free
Fun
Random team generator
Shuffle a list into balanced teams, with no saved history.
Runs in your browser · Free
Audio
PCM WAV joiner
Join clips in your chosen order, keeping their PCM samples unchanged.
Runs in your browser · Free
Audio
Normalize WAV audio
Bring a WAV’s sample peak to the level you choose.
16-bit PCM WAV · not loudness matching
Audio
WAV channel editor
Extract a stereo channel, mix to mono, swap channels or duplicate mono.
Runs in your browser · Free
Video
Video contact-sheet maker
Turn a video into timestamped thumbnails and individual PNG frames.
Runs in your browser · Free
Video
Video resizer & cropper
Resize, center crop or rotate a video and review the result.
Runs in your browser · Free
Data
CSV chart builder
Turn a CSV into a clear bar, line or scatter chart.
Runs in your browser · Free
Audio
Audio spectrum explorer
Explore frequencies in a local PCM WAV, one window at a time.
Runs in your browser · Free
Design
Room & furniture-fit planner
Arrange scaled furniture and check space before moving it.
Runs in your browser · Free
Science
Sun & shadow planner
See sun direction and a simple object’s shadow through the day.
Runs in your browser · Free
Finance
Mortgage calculator
Estimate a fixed-rate mortgage payment and the housing costs you enter.
Runs in your browser · Free
Finance
Loan calculator
Calculate fixed monthly loan payments, interest and a payment schedule.
Runs in your browser · Free
Finance
Auto loan calculator
Include vehicle price, trade-in, entered tax and financed fees in a car-loan estimate.
Runs in your browser · Free
Finance
Simple interest calculator
Calculate noncompounding interest from principal, rate and decimal years.
Runs in your browser · Free
Finance
Payment payoff calculator
Find how many monthly payments are needed to repay a fixed-rate balance.
Runs in your browser · Free
Finance
Retirement scenario calculator
Explore a retirement balance under explicit contribution, return and inflation assumptions.
Runs in your browser · Free
Finance
Amortization calculator
See monthly principal, interest and balance, including extra payments.
Runs in your browser · Free
Finance
Investment growth calculator
Project contributions and hypothetical growth with monthly compounding.
Runs in your browser · Free
Finance
Inflation assumption calculator
Compare future cost and purchasing power under a constant inflation assumption.
Runs in your browser · Free
Finance
Present & future value calculator
Solve a monthly contribution scenario for future value or the initial balance needed.
Runs in your browser · Free
Finance
U.S. federal income tax calculator · 2026
Estimate 2026 U.S. federal ordinary-income bracket tax from taxable income.
Runs in your browser · Free
Finance
Compound interest calculator
Compare compound interest with your starting balance and chosen compounding frequency.
Runs in your browser · Free
Finance
Gross salary converter
Convert gross annual, monthly, weekly and hourly pay under explicit work assumptions.
Runs in your browser · Free
Finance
Implied loan interest-rate calculator
Solve the nominal interest rate implied by fixed monthly loan payments.
Runs in your browser · Free
Finance
Sales tax calculator
Add a user-entered sales-tax rate or separate tax from an inclusive total.
Runs in your browser · Free
Medicine
Adult BMI calculator
Calculate adult BMI with unrounded screening categories.
Runs in your browser · Free
Medicine
Adult calorie scenario calculator
Explore resting energy and a user-chosen activity multiplier for adults.
Runs in your browser · Free
Medicine
BMI-based body-fat estimator
Explore a population-level body-fat estimate derived from BMI, age and a study coefficient.
Runs in your browser · Free
Medicine
Resting energy / BMR estimate
Calculate a resting-energy estimate with the original Mifflin–St Jeor equation.
Runs in your browser · Free
Medicine
Adult weight reference calculator
Translate the adult BMI reference band into a height-based weight range.
Runs in your browser · Free
Planning
Pace calculator
Convert running or walking distance and elapsed time into pace and speed.
Runs in your browser · Free
Medicine
Pregnancy dates & due-date calculator
Explore estimated due date, gestational weeks and a conventional conception reference.
Runs in your browser · Free
Math
Scientific calculator
Evaluate bounded scientific expressions with explicit angle units.
Runs in your browser · Free
Math
Percentage calculator
Find a percentage amount, ratio or signed percentage change.
Runs in your browser · Free
Math
Random number generator
Generate cryptographically random integers within inclusive bounds.
Runs in your browser · Free
Math
Triangle calculator · three sides
Solve a planar triangle’s area and angles from three side lengths.
Runs in your browser · Free
Math
Standard deviation calculator
Calculate mean, variance and population or sample standard deviation.
Runs in your browser · Free
Utilities
Age calculator
Calculate calendar age and elapsed days with an explicit leap-day convention.
Runs in your browser · Free
Utilities
Date calculator
Count days between dates or add calendar months and days.
Runs in your browser · Free
Utilities
Duration calculator
Add or subtract durations and convert the result to seconds and decimal hours.
Runs in your browser · Free
Utilities
Shift hours calculator
Calculate a same-day or overnight shift after an entered unpaid break.
Runs in your browser · Free
University & education
GPA calculator
Calculate a credit-weighted GPA on an explicit unweighted four-point scale.
Runs in your browser · Free
University & education
Weighted grade calculator
Calculate a weighted score from entered marks and relative weights.
Runs in your browser · Free
Utilities
Concrete volume calculator
Estimate rectangular concrete volume and an explicit waste allowance.
Runs in your browser · Free
Security
Password generator
Generate a local random password without sending or saving it.
Runs in your browser · Free
↳
We don’t have a tool for that yet.
Try a file type like “CSV,” a task like “trim video,” or browse all tools.
THE TOOLFRED WAY
A useful little corner
of the internet.
Open a tool. Do your thing.
Get back to your day.
Straight to the useful part.
No sign-up form between you and a quick fix. Pick a tool and get started.
Clear about the limits.
Supported formats and practical limits are explained before you start.