tool-nest.site

Simple, yet with all the tools you need

Calculators, converters, images, PDF and developer utilities — running locally in your browser. No account, no install. Welcome to tool-nest.site.
All
Calculators
Generators
Converters
Text
Images
PDF & documents
Developer tools
For kids

Calculators

%
Percentage calculatorFind a percent of a number, percent change, and share of total.
◷
Age calculatorExact age in years, months, and days.
⚖
BMI calculatorBody mass index with a WHO category.
D
Date calculatorAdd or subtract days, weeks, months; note business-day limits.
↔
Days between datesCount calendar days, weeks, or months between two dates.
٪
Discount calculatorStacked discounts, sale price, and amount saved.
✦
Tip calculatorTip by region, split the bill evenly or by share.
VAT
VAT calculatorAdd or remove EU VAT, net/gross, and deductible input VAT.
kcal
Calorie calculatorTDEE from Mifflin-St Jeor with deficit, surplus, and macro splits.
$
Salary calculatorGross to net with progressive tax brackets — generic international model.
∑
Loan calculatorEqual vs decreasing payments, APR, and total interest cost.
⌂
Mortgage calculatorMonthly payment, LTV, affordability, and side-by-side offer comparison.
↗
Compound interest calculatorCompound vs simple growth, contributions, and Rule of 72.
+%
Simple interest calculatorCompute interest: I = P × r × t without compounding.
⏱
Time calculatorAdd and subtract hours, minutes, and seconds.
H
Working hours calculatorCalculate hours worked from start, end, and break times.
L
Fuel cost calculatorTrip cost from distance, l/100km or MPG, and fuel price.
P
Pace calculatorMin/km vs min/mi, finish times, and training zone paces.
🎨
Paint calculatorRuns locally in your browser.
▦
Tile calculatorRuns locally in your browser.
▭
Flooring calculatorRuns locally in your browser.
▧
Concrete calculatorRuns locally in your browser.
|
Fence calculatorRuns locally in your browser.
⚡
Electricity cost calculatorRuns locally in your browser.
W
Power consumption calculatorRuns locally in your browser.
Ω
Ohm's law calculatorRuns locally in your browser.
🔋
Battery runtime calculatorRuns locally in your browser.
◎
Tire size calculatorRuns locally in your browser.
×
Recipe scalerRuns locally in your browser.
Mon
Business days calculatorRuns locally in your browser.
h
Hours calculatorRuns locally in your browser.
½
Fraction calculatorRuns locally in your browser.
:
Ratio calculatorRuns locally in your browser.
€
Profit margin calculatorRuns locally in your browser.
BE
Break-even calculatorRuns locally in your browser.
Δ%
Percentage change calculatorFind percent increase or decrease between two values.
BMR
BMR calculatorCompare Harris-Benedict and Mifflin-St Jeor; see BMR vs TDEE.
⚖
Ideal weight calculatorDevine, Robinson & Miller IBW formulas compared with BMI context.
A+
Grade calculatorWeighted averages, GPA, and final grade estimates.
ROI
ROI calculatorReturn on investment %, annualized ROI, ROI vs ROAS.
a:b
Rule of three calculatorSolve direct and inverse proportions — if A is to B, then C is to ?
☾
Sleep calculatorWake times aligned to 90-minute sleep cycles and ~15 min fall-asleep time.
❤
Due date calculatorNaegele's rule, trimester dates, and key pregnancy milestones.

Generators

#
Password generatorStrong random passwords with the character sets you choose.
▣
QR code generatorCreate a QR code from a link or text and download PNG.
?
Random number generatorPick a range, count, and optional unique draws.
⚄
Dice roller & coin flipRoll any-sided dice or flip coins — with totals.
⚑
Random team generatorSplit a name list into fair random teams.
***
PIN generatorRandom numeric PINs — set the length.
|||
Barcode generatorCODE128, EAN-13, UPC, and more — download PNG.

Converters

↕
Length converterConvert meters, feet, inches, miles, and kilometers.
⚖
Weight converterConvert kilograms, pounds, ounces, and stones.
°
Temperature converterConvert Celsius, Fahrenheit, and Kelvin.
▭
Area converterConvert m², ft², acres, hectares, and more.
▦
Volume converterConvert liters, gallons, mL, cups, and cubic meters.
»
Speed converterConvert km/h, mph, m/s, and knots.
KB
Data size converterConvert KB, MB, GB, TB — binary (KiB) vs decimal (KB).
px
Pixels to remConvert px to rem for accessible CSS typography.
em
Pixels to emConvert px to em relative to a parent font size.
MPG
MPG converterRuns locally in your browser.
cup
Cooking unit converterRuns locally in your browser.
XIV
Roman numeral converterConvert Arabic numbers ↔ Roman numerals (I, V, X, L, C, D, M).
0x
Number base converterConvert binary, octal, decimal, and hexadecimal.
bar
Pressure converterConvert Pa, bar, psi, atm, and mmHg.
kWh
Energy converterConvert joules, calories, kWh, and BTU.
EU
Shoe size converterConvert US, UK, EU, and CM foot lengths.
Aa1
Number to wordsSpell out numbers in English for checks and legal text.

Text

123
Word counterWords, characters, reading time; SEO title ~60 & meta ~160 limits.
Aa
Case converterSwitch text to UPPERCASE, lowercase, Title Case, or camelCase.
≡
Remove duplicate linesDelete repeated lines from lists, logs, and CSV exports.
±
Text diffCompare two texts side by side and highlight changes.
Lorem Ipsum generatorGenerate placeholder paragraphs, words, or sentences for mockups.
-a-
Slug generatorTurn titles into URL-friendly slugs for SEO and CMS paths.
⇋
Reverse textReverse characters, words, or lines for puzzles and encoding tricks.

Images

⛶
Image resizerChange image width and height in your browser.
▽
Image compressorReduce JPG/PNG file size with no install.
JPG
JPG compressorReduce JPEG file size with adjustable quality — runs locally.
PNG
PNG compressorShrink PNG files while preserving transparency.
J→P
JPG to PNGConvert JPEG photos to lossless PNG format.
P→J
PNG to JPGConvert PNG images to smaller JPEG files.
J→W
JPG to WebPConvert JPEG to modern WebP for smaller web files.
P→W
PNG to WebPConvert PNG to WebP — often half the size with transparency.
W→J
WebP to JPGConvert WebP images to universally compatible JPEG.
↻
Image rotatorRotate photos 90°, 180°, or 270° — fix orientation.
⇄
Image flipperMirror images horizontally or vertically.
✂
Image cropperCrop to region, aspect ratio, or social sizes.
⌀
EXIF removerStrip GPS, camera, and metadata from photos.
S→P
SVG to PNGRasterize vector SVG to PNG at any size.
b64
Image to Base64Encode images as Base64 data URLs for HTML/CSS.
ico
Favicon generatorCreate favicon.ico and PNG sizes from one image.
H→J
HEIC to JPGConvert iPhone HEIC photos to JPEG.

PDF & documents

▢
JPG to PDFTurn JPG/PNG photos into one PDF file.
☰
Merge PDFCombine several PDF files into one document.
P→D
PNG to PDFTurn PNG images into a PDF document.
✂
Split PDFExtract page ranges or split every page into files.
↻
Rotate PDF pagesFix sideways or upside-down PDF pages.
⊟
Extract PDF pagesSave selected pages as a new PDF.
⌫
Delete PDF pagesRemove unwanted pages from a PDF.
#
PDF page numberingAdd page numbers to PDF headers or footers.
WM
PDF watermarkAdd DRAFT, CONFIDENTIAL, or custom text overlays.
PW
PDF password protectorEncrypt PDF with open password and permissions.
⌀
PDF metadata removerStrip author, title, and hidden PDF properties.
D→J
PDF to JPGConvert PDF pages to JPEG images.
✍
Sign PDFDraw or type signature and place on PDF.
FV
Invoice generatorCreate professional PDF invoices with line items.
CV
CV generatorBuild a resume/CV and download PDF.

Developer tools

{ }
JSON formatterValidate, pretty-print, minify — debug API responses locally.
✓
JSON validatorCheck JSON syntax and see parse errors.
{…}
JSON minifierRemove whitespace for compact JSON payloads.
J→C
JSON to CSVConvert JSON arrays to spreadsheet CSV.
C→J
CSV to JSONParse CSV into JSON arrays for APIs.
</>
XML formatterPretty-print and indent XML documents.
Y→J
YAML to JSONConvert YAML configs to JSON.
64
Base64 encoder / decoderEncode text or decode Base64 to UTF-8.
%20
URL encoder / decoderPercent-encode query strings and decode URI components.
&lt;
HTML encoder / decoderEscape <, >, & for safe HTML text nodes.
JWT
JWT decoderInspect header, payload, and expiration claims.
id
UUID generatorGenerate random UUID v4 identifiers.
##
Hash generatorCompute MD5, SHA-1, SHA-256 hashes of text.
.*
Regex testerTest regular expressions with match highlighting.
cron
Cron generatorBuild cron expressions with plain-language preview.
ts
Unix timestamp converterConvert epoch seconds/ms to human dates.
#c
Color converterConvert HEX, RGB, HSL; notes on color theory and a11y.
◐
Contrast checkerWCAG 2.1 AA/AAA contrast ratios for text and UI.
▤
CSS gradient generatorLinear or radial gradients — live preview and copy CSS.
❏
CSS box-shadow generatorOffset, blur, spread, color — live preview and copy CSS.
▣?
QR code readerDecode QR codes from image or camera.
SQL
SQL formatterPretty-print SQL queries with indentation.
MD
Markdown to HTMLConvert Markdown text to HTML snippet.
755
Chmod calculatorConvert between rwx, symbolic, and octal chmod.
/24
Subnet calculatorCIDR to netmask, IP range, broadcast address.

For kids

▦
Maze generatorPrintable maze for kids — PDF.
W
Word search generatorCustom word list, grid size, printable PDF.
9
Sudoku generator9×9 puzzles — easy, medium, hard — PDF with optional answers.
B
Bingo card generator5×5 B-I-N-G-O cards — free center, printable PDF.
+−
Math worksheet generatorPrintable drills — add, subtract, multiply, divide.
✎
Handwriting worksheet generatorTrace-and-copy lines for letters and words — PDF.
❀
Coloring page generatorMandala, flowers, or shapes — adjustable complexity — PDF.
C
Crossword puzzle generatorRuns locally in your browser.
D
Dot-to-dot generatorRuns locally in your browser.
N
Number tracing worksheetRuns locally in your browser.
C
Telling time worksheetRuns locally in your browser.
M
Memory cards printableRuns locally in your browser.
P
Pattern completion worksheetRuns locally in your browser.
C
Cross math puzzle generatorRuns locally in your browser.
tool-nest.site is a free online tools website. Most tools do not use AI and do not upload your files to our servers — calculations and conversions happen on your device.
You will find calculators, unit converters, developer tools, image and PDF helpers and printable kids activities. Every page includes instructions, examples, FAQ and usage guidance.
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