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➗ MathFree
Prolate spheroid calculator
Enter the two semi-axes of a prolate spheroid and get its volume, surface area and eccentricity: with a of 5 and c of 3, the volume is 188.495559, the surface…
A
Runs in your browser
➗ MathFree
Ptolemy theorem calculator
Solve a missing side or diagonal of a quadrilateral inscribed in a circle with Ptolemy's theorem: with sides 3, 4, 5 and 6 and one diagonal of 5, the other…
A
Runs in your browser
➗ MathFree
Spherical law of cosines
Find side c of a spherical triangle from sides a and b and the angle C between them, or recover C from all three sides: sides of 1 and 1 with an angle of 1…
A
Runs in your browser
➗ MathFree
French words to number
Type a French number in words and get it in digits: “vingt et un” becomes 21. It reads whole numbers from zéro up to 999, with or without hyphens.
A
Runs in your browser
➗ MathFree
Fréchet distribution calculator
Enter a point and the three numbers of a Fréchet distribution: at the point 1, with shape 2, scale 1 and location 0, the cumulative probability is 0.367879 and…
A
Runs in your browser
✍️ Text & AIFree
CSV field escape (RFC 4180)
A value like Smith, John becomes "Smith, John" so its comma doesn't split the column, and every inner double quote is written twice, as RFC 4180 requires.
A
Runs in your browser
✍️ Text & AIFree
Glob to regex converter
Turn a wildcard pattern like *.js into the matching regular expression: you get ^[^/]*\.js$. Handy when a tool wants a regular expression and you think in…
A
Runs in your browser
✍️ Text & AIFree
Grapheme count calculator
Count the characters a person actually sees in a text, also known as graphemes, along with its code points and UTF-16 units: abc gives 3, 3 and 3.
A
Runs in your browser
✍️ Text & AIFree
Markdown escape
Put a backslash in front of every character Markdown would treat as formatting, so *x* becomes \*x\* and displays with its asterisks instead of as italics.
A
Runs in your browser
✍️ Text & AIFree
Parentheses / brackets balance checker
Paste text and find out whether every (, [ and { closes in the right order: (a[b]) is balanced, with a maximum depth of 2.
A
Runs in your browser
✍️ Text & AIFree
Path parts splitter
Paste /home/a/file.tar.gz and get its parts: folder /home/a, file name file.tar.gz, name file.tar, extension .gz and root /.
A
Runs in your browser
✍️ Text & AIFree
Template placeholder extractor
Paste Hi {{name}} and {{name}} and get one placeholder, name, counted once: every distinct gap in your template, with nothing filled in.
A
Runs in your browser
✍️ Text & AIFree
ROT47 encoder/decoder
«Hello» becomes «w6==@»: each printable ASCII character shifts 47 places around a circle of 94, and running the result through again restores the original.
A
Runs in your browser
✍️ Text & AIFree
SemVer compare (2.0.0)
1.0.0 against 1.0.1 gives −1: the first version ranks lower. The comparison follows Semantic Versioning 2.0.0 to the letter, so you never have to sort version…
A
Runs in your browser
✍️ Text & AIFree
Shell escape (POSIX)
Turn any text into a safe shell argument: «it's» comes out as 'it'\''s', which bash reads back as exactly it's.
A
Runs in your browser
✍️ Text & AIFree
UTF-8 hex encoder
Type «Hi» and get 48 69: the two UTF-8 bytes of your text, each written as two hexadecimal digits.
A
Runs in your browser
✍️ Text & AIFree
Call-to-action strength checker
The sample trial sign-up phrase scores 93 of 100: 40 of 40 for opening with the verb “start”, 35 of 35 for clarity and 18 of 25 for the cue “today”.
B
Runs in your browser
✍️ Text & AIFree
Check email subject line length
“Your order ships tomorrow morning” has 33 characters, so it fits both the 40-character mobile preview and the 70-character desktop one.
A
Runs in your browser
✍️ Text & AIFree
Check readability for a target audience by grade level
A grade level of 7.4 for the general public falls inside the 6 to 8 range, so it matches; children expect grades 1 to 5 and technical readers 9 to 14.
B
Runs in your browser
✍️ Text & AIFree
Classify text overall tone from a custom word lexicon
In the sample request, three formal words, one urgent and one friendly give a formal tone with a confidence of 0.6, that is 3 of 5 matches.
K
Runs in your browser
✍️ Text & AIFree
Word count by paragraph
In a sample with paragraphs of 4, 12 and 2 words, the average is 6, so the 12-word paragraph is flagged far above average and the 2-word one far below.
F
Runs in your browser
✍️ Text & AIFree
Check gender-neutral language
Give it your glossary and a draft: in the sample text, “chairman” is flagged twice with “chairperson” as the neutral choice and “fireman” once with…
A
Runs in your browser
✍️ Text & AIFree
Sentence grammatical complexity score
A 20-word sentence with “because”, “but” and “that” scores 75 of 100: 45 points for three connectors plus 30 for length, which rates it very complex.
B
Runs in your browser
✍️ Text & AIFree
Apply AP, Chicago, or APA title capitalization rules
In Chicago style, “a tale of two cities: writing in the modern world” becomes “A Tale of Two Cities: Writing in the Modern World”.
F
Runs in your browser
✍️ Text & AIFree
Detect nearby word repetition in your writing
In the sample sentence, “final” appears at word 2 and again at word 10, exactly 8 positions apart, so a window of 8 flags it.
K
Runs in your browser
➗ MathFree
3D distance calculator
From (1.5, 2.5, 3.5) to (4.5, 6.5, 8.5) the gaps are 3, 4 and 5, so the straight-line distance is 7.07106781187.
A
Runs in your browser
🖼️ ImagesFree
Image ICC profile lookup
Paste the color profile name your editor shows and learn which standard it is: Display P3 is recognized as the wide-gamut profile for modern screens and mobile…
F
Runs in your browser
🖼️ ImagesFree
Batch Rename Images by Pattern with Numbered Filenames
With the pattern gallery-{counter:3}{ext} starting at 7, IMG_4102.JPG, IMG_4103.JPG and detail.PNG become gallery-007.JPG, gallery-008.JPG and gallery-009.PNG.
K
Runs in your browser
🖼️ ImagesFree
Centered face crop estimator
A 200 × 240 face at 400, 250 in a 1200 × 900 photo gives a 360-pixel square starting at x 320, y 190, with the face centered and a quarter of margin on every…
G
Runs in your browser
🖼️ ImagesFree
Detect duplicate images by hash
Five images with 64-bit hashes and a 5-bit threshold fall into 2 groups, three versions of a banner and two of a logo, so all 5 are duplicates and none is…
A
Runs in your browser
🖼️ ImagesFree
Extract photo date taken from EXIF
Turn the date your camera wrote, 2023:06:15 14:30:45, into a normal date and time: 2023-06-15 and 14:30:45, plus the combined 2023-06-15T14:30:45.
A
Runs in your browser
🖼️ ImagesFree
Confirm GPS metadata was removed from an image
Compare a photo's metadata before and after stripping and confirm that no location survives: in the example, the latitude, longitude and altitude tags are…
B
Runs in your browser
🖼️ ImagesFree
Resize image by percentage
At 50 percent, a 1920 × 1080 image becomes 960 × 540 pixels, which keeps a quarter of the pixels, not half.
H
Runs in your browser
🖼️ ImagesFree
Resize image canvas with padding
Put a 1200 × 800 image on a 1601 × 1001 canvas and get the exact margins: 200 px left, 201 right, 100 top and 101 bottom.
F
Runs in your browser
🖼️ ImagesFree
Replace a specific color in an image
Turn red into green across a list of image pixels. With a tolerance of 32, the pure red and the two near-reds change, so 3 of 5 pixels are replaced.
H
Runs in your browser
🖼️ ImagesFree
Build a before-and-after image comparison layout
Two 1200 × 800 photos with the slider at 37.5 % put the divider at pixel 450: the before image fills the first 450 pixels and the after image the other 750.
B
Runs in your browser
🖼️ ImagesFree
Rule of thirds grid calculator
Get the exact rule-of-thirds guides for any image size: on a 1200 by 800 picture the vertical lines fall at 400 and 800 pixels, alongside two horizontal lines…
K
Runs in your browser
🖼️ ImagesFree
Estimate panorama canvas width from overlapping photos, free
Three 4000-pixel photos overlapping by 30% and 25% stitch into a panorama 9,800 pixels wide, not 12,000.
G
Runs in your browser
🖼️ ImagesFree
SVG rasterization size calculator
A 24×24 viewBox exported at 2× becomes a 48×48 PNG. Enter the viewBox and either a scale or a target width to get whole-pixel dimensions, the aspect ratio and…
A
Runs in your browser
❤️ Health & fitnessFree
Calculate baseball batting average
125 hits in 412 at-bats is a .303 batting average: the raw 0.303398 is rounded to three places and shown with the leading zero dropped, as scoreboards write it.
A
Runs in your browser
❤️ Health & fitnessFree
Basketball plus-minus calculator
If a team scores 58 and concedes 51 during a guard's minutes, that guard is +7, whether the guard scored two points or thirty: the raw on-court differential…
G
Runs in your browser
❤️ Health & fitnessFree
Calculate team win percentage
A 10-4-2 record is a .688 win percentage, because each tie counts as half a win: enter wins, losses and ties and get the figure printed in league standings.
A
Runs in your browser
❤️ Health & fitnessFree
Hair color lift estimator
Going from a level 4 brown to a level 8 blonde means lifting 4 levels, more than the 2 that permanent color can manage, so bleach followed by toner is the…
H
Runs in your browser
❤️ Health & fitnessFree
Hair porosity estimate from a float test result
A clean strand that sinks fast in a glass of water points to high porosity: moisture gets in quickly and escapes just as fast, so layer moisture and seal it…
H
Runs in your browser
❤️ Health & fitnessFree
Piercing healing timeline calculator
An earlobe pierced on 2026-05-01 reaches its 42-day minimum estimate on 2026-06-12, so on 2026-06-19 it shows 49 days elapsed and 100% progress.
K
Runs in your browser
✅ ValidationFree
Classify Skin Type from Quiz Answers
High oiliness, low sensitivity and large pores give oily skin with 10 points, ahead of combination with 5, normal with 2 and dry with 1.
K
Runs in your browser
❤️ Health & fitnessFree
Sunscreen reapplication schedule
Starting at 09:30 with a 2-hour interval over 6 hours gives four applications: 09:30, 11:30, 13:30 and 15:30, ready to set as phone alarms.
A
Runs in your browser
📄 Documents & PDFFree
Apply Bates numbering
Plan Bates labels before anything is stamped: four pages with the prefix CASE- starting at 17 and five digits become CASE-00017 to CASE-00020.
F
Runs in your browser
📄 Documents & PDFFree
Count words in a PDF
Two pages holding 11 and 8 words give 19 words, 93 characters, 75 without spaces and an average of 9.5 words per page.
A
Runs in your browser
📄 Documents & PDFFree
Add a PDF signature field
A 200 by 50 point field placed at 72, 72 on a 612 by 792 Letter page fits, with 340 points to spare on the right and 670 above, in the bottom-left quadrant.
A
Runs in your browser
📄 Documents & PDFFree
Extract PDF links
Seven annotations from a PDF reader come back as the four real web links, each with its page number, while comments, highlights and internal page jumps are left…
G
Runs in your browser
📄 Documents & PDFFree
Extract tables from PDF text
Text whose values line up by tabs, such as Cable, 25 and 1.20, becomes a table with three named columns and three rows of data.
H
Runs in your browser
❤️ Health & fitnessFree
Golf Stroke Play Score to Par Calculator
71 strokes on a par-72 course is one under, shown as -1: enter your strokes and the course pars hole by hole, in playing order, and get the totals plus the…
F
Runs in your browser
❤️ Health & fitnessFree
Cricket run rate calculator
145 runs from 18.2 overs is a run rate of 7.909, and chasing 221 with 11.4 overs left needs 6.514 an over: the calculator reads overs as balls, the way scorers…
B
Runs in your browser
✍️ Text & AIFree
Compare text line differences
Compare alpha, beta, gamma with alpha, beta updated, gamma, delta and you get 2 lines added, 1 removed and 2 unchanged, each with its line number.
K
Runs in your browser
✍️ Text & AIFree
Compute text readability score
Paste English text and see its Flesch Reading Ease and grade level: «The sun is warm. Birds sing in the trees.» scores 117.67 and −2.03, from 2 sentences, 9…
F
Runs in your browser
✍️ Text & AIFree
Repeat text N times with an optional separator
Type «echo», choose 3 copies and the separator « | », and you get «echo | echo | echo», 18 characters, with separators only between copies, never at the ends.
K
Runs in your browser
✍️ Text & AIFree
Scramble word letters
«generation» with the seed «kit-2026» always becomes «gateeonrin»: the first and last letters stay, the 8 inside letters are shuffled, and the same seed gives…
A
Runs in your browser
✍️ Text & AIFree
Split text into columns for balanced side-by-side display
Seven lines in three columns come out as three, two and two: the groups never differ by more than one line, the earlier columns take the extras, and blank lines…
B
Runs in your browser
✍️ Text & AIFree
Wrap text to a fixed line width
Set a width of 40 and a long sentence comes back as 3 lines, none wider than 40 characters and no word cut in half.
G
Runs in your browser
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How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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