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All tools
Every VoltKit tool, filterable by category. All run locally in your browser.
Mortgage Calculator
Monthly payment, total interest and a full amortization schedule.
Loan / EMI Calculator
EMI, total interest and repayment schedule for any loan.
Percentage Calculator
What is X% of Y, percent change, and reverse percentages.
Currency & Crypto Converter
Real-time FX + crypto rates with an FX margin calculator.
Payment Gateway Fee Calculator
Stripe, PayPal, Wise, Razorpay fees + FX conversion cost.
Unit Converter
Length, weight, temperature, volume, area, speed, data & more.
BMI Calculator
Body mass index with healthy weight range and category.
Calorie Calculator
Daily calorie needs (TDEE), BMR and goal-based targets.
PDF Merge
Combine multiple PDFs into one, reorder pages, in your browser.
PDF Split
Extract pages or split a PDF into ranges — locally.
PDF Compress
Reduce PDF size with smart image re-encoding, offline.
PDF Maker
Turn images or text into a clean PDF in seconds.
Image Compressor
Shrink JPG, PNG and WebP with a live quality slider.
Image Converter
Convert PNG, JPG, WebP, AVIF, GIF, BMP, SVG & HEIC-ready.
Image Quality Enhancer
Upscale 2×, sharpen, denoise and auto-correct in-browser.
File Converter
JSON ⇄ CSV ⇄ YAML ⇄ XML, Base64, text and images.
Code Formatter
Beautify or minify JSON, HTML, CSS, JS, SQL & XML.
QR Code Generator
URL, text, Wi-Fi, vCard & email QR codes in PNG or SVG.
AI Background Remover
Cut out backgrounds with on-device AI and export transparent PNG.
OCR Text Extractor
Pull editable text out of images and scanned PDFs, locally.
PDF Watermark & Unlock
Add text or logo watermarks and remove PDF passwords.
Invoice Generator
Build a branded invoice with line items, tax and PDF export.
Quotation Generator
Send a polished quote or estimate with validity and terms.
E-commerce Profit Calculator
Marketplace fees, ads, shipping → true profit and sale price.
Code & Text Diff
Side-by-side or inline diff for code, text, JSON and config.
JWT Decoder
Decode and inspect JWT header, payload, expiry and claims.
Stripe Fee Calculator
Exact Stripe fees, net payout and FX cost per transaction.
PayPal Fee Calculator
PayPal fees, cross-border cost and FX margin per payment.
HEIC to JPG Converter
Convert iPhone HEIC photos to JPG in your browser.
PDF to Text (OCR)
Turn scanned PDFs into editable, copyable text.
Image Resizer & Cropper
Resize to exact pixels or social presets, crop to any aspect ratio.
Password Generator
Strong random passwords and passphrases with a strength meter.
SIP & Investment Calculator
Monthly SIP, lump sum and step-up returns with a growth chart.
PDF to JPG / PNG
Turn every PDF page into a high-resolution image.
Word Counter & Text Analyzer
Live word, character and sentence counts with reading time.
Compound Interest Calculator
See savings grow with monthly deposits and a growth chart.