ITSYTOOLS
Free Online Tools & Calculators
PDF, image, file and electrical engineering tools — processed on your device.
57 tools
PDF & Documents
View all 11
JPG → PDF · Combine & Fit PDF
Combine photos and PDFs in order, then download one PDF under your limit.
PDF + PDF
Merge PDF files
Combine PDFs in your chosen order.
PDF → DOCX
PDF to Word
Convert PDF pages to a Word document with editable text or preserved appearance.
DOCX → PDF
Word to PDF
Convert DOCX documents to PDF in your browser.
PDF
Add page numbers to PDF
Number the pages of a PDF.
PDF
Add watermark to PDF
Add text or a logo to selected PDF pages.
PDF
Organize PDF pages
Reorder, rotate, remove, split, or extract pages.
PDF → JPG · PNG · WebP
PDF to Image
Convert PDF pages to JPG, PNG or WebP.
PDF → PPTX
PDF to PowerPoint
Turn PDF pages into PowerPoint slides while preserving their appearance.
PPTX → PDF
PowerPoint to PDF
Convert PPTX slides to a PDF in your browser.
Images & Photos
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Image Compressor — TinyEnough
Set a file size limit and download an image that fits.
JPG · PNG · WebP
Image resize and crop
Resize and crop one image or a batch.
JPG · PNG · WebP · BMP → TXT
Image to text — private OCR
Extract text from photos and screenshots.
JPG · PNG · WebP
Screenshot and photo privacy cleaner
Blur or cover private details and remove metadata.
JPG · PNG · WebP
Batch photo watermarking
Add a text or logo watermark to multiple photos.
HEIC · HEIF → JPG
HEIC to JPG
Convert HEIC and HEIF photos to JPG in your browser.
Data & Spreadsheets
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Creative & QR
View all 5
Wi-Fi QR Code Generator
Create a Wi-Fi or web link sign and download a print-ready PDF.
JPG · PNG · WebP
Photo collage and image stitcher
Arrange photos in a grid or stitch them side by side or top to bottom.
JPG · PNG · WebP · GIF
Meme maker
Add text to a photo or animated GIF.
PNG · JPG → SVG
PNG/JPG to SVG vectorizer
Turn a PNG or JPG into editable SVG shapes.
Electrical & Electronics
View all 31
Ohm’s Law & DC Power Calculator
Calculate voltage, current, resistance and power from two known values, with a live circuit diagram.
V · Ω
Voltage Divider Calculator
Calculate output voltage with load and tolerance, or find standard resistor pairs for a target voltage.
V/V · Ω
Op-Amp Gain & Feedback Calculator
Calculate inverting or non-inverting op-amp gain and output, or find standard feedback resistor pairs for a target gain.
BJT · Ω · mA
BJT Switch & Base Resistor Calculator
Size NPN or PNP switching base resistors and estimate base current and resistor/transistor dissipation.
4–20 mA · %
4–20 mA Signal Scaling Calculator
Convert loop current to engineering units or calculate current from a measured value.
555 · Hz · s
555 Timer Calculator
Calculate 555 oscillator timing and one-shot pulse width, or choose standard resistors for a target frequency or pulse.
Hz · Q · dB
Active Filter Calculator
Design low-pass, high-pass and band-pass filters with component selection and response plots.
Ah · Wh · h
Battery Runtime Calculator
Estimate battery life from Ah or Wh, device loads, reserve charge and conversion efficiency.
BJT · V/V · Ω
BJT Amplifier & Emitter Follower Calculator
Calculate bias, loaded gain, resistance and signal swing for NPN/PNP amplifiers.
BJT · IC · VCE
BJT Bias & Operating Point Calculator
Calculate NPN/PNP bias currents, voltages and operating region, with a DC load line.
DC/DC · µH · µF
Buck & Boost Converter Calculator
Size or check a buck or boost converter inductor, estimate current and output ripple, and compare capacitor and power requirements.
V · Ω · VHYS
Comparator & Schmitt Trigger Calculator
Calculate switching thresholds and hysteresis, or choose standard feedback resistors.
dB · dBm · W
dB, dBm & Watts Converter
Convert power and RMS voltage levels, or calculate gain and loss ratios.
V · AWG · mm²
DC Voltage Drop Calculator
Calculate cable voltage drop, load voltage and power loss with copper or aluminium, AWG or mm².
W · kWh
Electricity Cost & kWh Calculator
Estimate energy use and electricity costs for multiple appliances, including operating schedules and standby power.
ΔV · G · Ω
Instrumentation Amplifier Calculator
Calculate gain, choose gain resistors and check internal output voltages.
LED · Ω · W
LED Resistor Calculator
Find a standard resistor for one LED or a series string, with estimated current and power dissipation.
LDO · V · W
Linear Regulator & LDO Calculator
Estimate linear-regulator power loss, efficiency, dropout margin, junction temperature and load limits.
MOSFET · W · nC
MOSFET Loss & Gate Drive Calculator
Estimate DC or PWM conduction and switching losses, gate-drive power and charging current.
MHz · V/µs
Op-Amp Bandwidth & Slew Rate Calculator
Estimate op-amp bandwidth, sine-wave slew requirements and amplitude or frequency limits.
Σ · V/V · Ω
Op-Amp Summing & Difference Calculator
Calculate weighted sums or voltage differences, choose matched resistor pairs and check output limits.
PCB · mm · A
PCB Trace Width & Current Capacity Calculator
Estimate PCB trace width or current capacity, with copper thickness, resistance, voltage drop and power loss.
PoE · W · PSE
PoE Power Budget Calculator
Plan switch power and port capacity for PoE devices, with reserve and per-port checks.
RC · s · Hz
RC Timing & Filter Calculator
Calculate RC time constants, capacitor charging and discharging, and passive low-pass or high-pass filter response.
Ω · SMD
Resistor Color Code & SMD Decoder
Decode 4, 5 or 6 resistor bands and SMD markings, or turn a resistance value into a color code.
Ω · H · F
RLC Impedance & Resonance Calculator
Calculate series or parallel RLC impedance, phase, resonance, quality factor and bandwidth with a frequency plot.
Ω · F
Series & Parallel Component Calculator
Calculate equivalent resistance or capacitance for multiple components connected in series or parallel, with a circuit diagram.
TIA · V/A · pF
Transimpedance Amplifier Calculator
Convert sensor current to voltage, choose a feedback resistor and estimate capacitance and bandwidth.
°C · W · °C/W
Transistor Thermal & Heatsink Calculator
Estimate junction temperature, thermal margin, maximum dissipation and required heatsink resistance.
W · A · kVA
Watts to Amps & AC Power Calculator
Convert watts, amps and VA for single-phase or balanced three-phase AC with power factor.
Zener · Ω · W
Zener Diode & Series Resistor Calculator
Choose or check a Zener regulator resistor across supply and load extremes, including tolerance and power.
Developer Tools
View all 4
JSON Formatter & Validator
Format, validate and minify JSON, or sort keys without rounding numbers.
JSON ↔ YAML
JSON ↔ YAML Converter
Convert JSON to YAML or YAML to JSON locally, with nested arrays, strings and exact numbers.
Base64 · UTF-8
Base64 Encoder & Decoder
Encode UTF-8 text or files and decode standard or URL-safe Base64, with direct downloads.
Unix · ISO 8601
Unix Timestamp Converter
Convert timestamps in seconds or milliseconds to ISO dates and time zones, or convert an ISO date back to a timestamp.
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