Every tool in the toolbox, and exactly when you'd reach for it

💳 Credit Card Payoff Calculator

Credit card interest compounds daily, so the number on a statement rarely tells the full story. This calculator takes your balance, interest rate, and monthly payment, then shows exactly how many months it will take to reach zero and how much you'll pay in interest along the way. Adjust the payment amount and watch the payoff date move — it's the fastest way to see whether an extra $50 a month is actually worth the sacrifice before committing to it.

📈 Investment Calculator

Compound growth is easy to describe and hard to picture. This calculator projects how a starting amount plus regular contributions grows over time at a given rate of return, breaking results down so contributions and growth are shown separately. It's built for sketching out a retirement plan, comparing a lump-sum deposit against monthly investing, or answering "what if I'd started ten years earlier?" with real numbers instead of a guess.

📝 JSON Formatter

Minified API responses and config files are unreadable by design. This tool takes a wall of compressed JSON and reformats it with proper indentation, line breaks, and syntax highlighting, while flagging errors like a missing comma or an unclosed bracket. It's the tool to paste a webhook payload into when you need to actually read it, or to validate a config file before it breaks a deploy.

🔐 JWT Decoder

JSON Web Tokens look like gibberish until decoded. This tool splits a JWT into its header, payload, and signature, and displays the claims as readable JSON, entirely inside your browser — nothing is sent to a server. It's useful for debugging an authentication flow, checking when a token expires, or confirming an API is issuing the claims your backend expects, without pasting sensitive tokens into a third-party service.

🆔 UUID Generator

Need a unique identifier for a database row, a test fixture, or a session ID? This generator produces RFC-compliant version 4 UUIDs instantly, individually or in bulk batches, ready to copy and paste. It saves the few seconds of writing a one-line script just to get a random ID — which adds up fast when seeding test data or scaffolding a new project.

🔤 Base64 Encoder

Base64 shows up everywhere, from email attachments to embedded images and API authentication headers. This tool encodes plain text or files into Base64, and decodes Base64 strings back into readable content, instantly and locally. It's handy for embedding a small image directly in CSS, decoding a basic-auth header to check credentials, or figuring out why a piece of encoded data isn't decoding the way you expect.

🕐 Timestamp Converter

Unix timestamps are great for computers and unreadable for humans. This converter turns a timestamp into a readable date and time in any timezone, and works the other way too — pick a date and get the corresponding epoch value. It's a regular stop for anyone reading server logs, debugging a scheduled job, or figuring out exactly when an event with a raw timestamp actually happened.

📱 QR Code Generator

This tool turns a URL, WiFi network, contact card, or plain text into a scannable QR code you can download as an image. It's used for putting a menu or portfolio link on printed material, sharing WiFi credentials with guests without reading out a password, or adding a quick scan-to-visit code to a flyer or product label — no app or account required.

🗜️ HTML Minifier

This tool strips whitespace, line breaks, and comments out of HTML to shrink file size before deployment. Smaller HTML means faster page loads, particularly on slower mobile connections where every kilobyte matters. It's a quick step to run static pages or email templates through before they go live, especially on projects where a build pipeline doesn't already handle minification automatically.

🎨 CSS Minifier

Like its HTML counterpart, this tool compresses a stylesheet by removing unnecessary spacing, comments, and line breaks without changing how it renders. The result is a smaller file that loads faster. It's useful for tidying up a stylesheet written during development, or for projects without a build process where minification isn't already part of the deployment routine.

🔍 Regex Tester

Regular expressions are powerful and notoriously easy to get wrong. This tester lets you write a pattern, paste in sample text, and see exactly which parts match — highlighted in real time, along with capture groups. It turns trial-and-error guessing into something visual: instead of running a script five times to validate an email pattern, you watch the result update as you type.

⏰ Cron Expression Generator

Cron syntax is compact and unforgiving — one misplaced asterisk and a job runs every minute instead of once a day. This tool builds a schedule from plain language ("every weekday at 9am," "every 15 minutes," "the first of the month") and outputs the correct cron expression, along with a plain-English explanation of what it does, so you can double-check it before it goes anywhere near production.

🖼️ Image Compressor

Large image files slow down websites, fill up storage, and make uploads frustrating. This tool reduces an image's file size while keeping it visually sharp, with a compression level you control to balance quality against size. It's a regular step for anyone preparing photos for a website, an online store listing, or an email attachment that keeps bouncing back for being too large.

🔄 PNG to JPG

PNG files preserve transparency and sharp edges, but tend to be far larger than they need to be for photos. This tool converts PNG images to JPG, a format that compresses photographic content far more efficiently — the right move when a smaller file matters more than a transparent background.

🖼️ WebP to JPG

WebP is efficient, but not every platform, email client, or older device displays it correctly. This tool converts WebP images back into the universally supported JPG format, so an image saved from a modern website doesn't fail to open in software that hasn't caught up — handy when downloading images for a presentation, document, or print job.

📄 PDF Merge

Scanned receipts, signed contract pages, and separate reports often need to land in one file before they can be submitted or filed. This tool combines multiple PDFs into a single document in the order you choose — quicker than opening a full desktop application just to staple a handful of files together for a one-time task.

✂️ PDF Split

Sometimes a 200-page PDF only needs to share three pages. This tool extracts specific pages from a larger document, or breaks one PDF into several smaller files, so you can send exactly the section someone needs without forwarding the entire original — useful for contracts, textbooks, or reports where only part is relevant to the recipient.

🔄 PDF Rotate

A scanned page that landed sideways or upside down is a small annoyance that's surprisingly hard to fix without the right software. This tool rotates individual pages or an entire PDF clockwise or counter-clockwise and saves the corrected version, fixing scans from a phone camera or office scanner in a few seconds.

🗜️ PDF Compressor

Email attachment limits and slow upload portals make oversized PDFs a recurring headache, especially for scanned documents full of images. This tool shrinks a PDF's file size while keeping text and images legible — often the difference between a form submission going through and bouncing back with a "file too large" error.

📝 PDF to Word

Editing a PDF directly is clunky at best. This tool converts a PDF into an editable Word document, preserving the original layout, text, and formatting as closely as possible — so you can update a resume, revise a contract clause, or pull content into a new document without retyping everything from a static file.

📸 Website Screenshot

This tool captures a full-page screenshot of any public website, including content normally hidden below the fold, and returns it as a downloadable image. It's used for archiving how a page looked at a point in time, building a portfolio of design work, or grabbing a clean visual for a report without manually stitching scrolled screenshots together.

🌍 Local Time / World Clock

Coordinating a call across time zones means doing mental math that's easy to get wrong. This tool shows the current time in any city or timezone side by side, so scheduling a meeting with a remote team, a flight layover, or a call with family overseas doesn't require guessing whether 3pm your time is morning or evening for them.

⏱️ Stopwatch

A precise, lap-capable stopwatch for timing anything that needs accurate tracking — a workout interval, a presentation rehearsal, or a cooking step. Lap times are recorded individually so splits can be compared afterward, something a phone's basic clock app often makes more fiddly than it needs to be.

⏲️ Timer

A countdown timer with an audio alert for anything with a fixed duration — a study session, a load of laundry, a recipe step, or a timed test. Set the duration once and it counts down in the background while you do something else, then alerts you the moment time is up.

✍️ AI Text Prompt Generator

Getting a useful response from ChatGPT, Claude, or any other language model often comes down to how the prompt is structured. This tool helps build a clear, detailed prompt by walking through the goal, context, tone, and format you want, turning a vague idea into specific instructions — useful for writing, coding, or brainstorming tasks where a better prompt means a better first answer.

🎨 AI Image Prompt Generator

Image generators like Midjourney, DALL-E, and Stable Diffusion respond well to specific, descriptive language — style, lighting, composition, and mood all matter. This tool helps assemble a detailed image prompt from those building blocks, so instead of guessing at the right combination of words, you get a structured starting point that's more likely to produce the image you actually pictured.

🔍 WHOIS Lookup

This tool looks up the public registration details behind a domain name — who registered it, which registrar it's with, when it was created, and when it expires. It's used to check whether a domain is available before buying it, verify the legitimacy of a website, or find out how much runway is left before a domain renewal is due.

🌍 DNS Lookup

DNS records control where a domain's traffic, email, and verification checks actually point. This tool queries A, AAAA, MX, NS, TXT, and CNAME records for any domain — the first step when troubleshooting why a website isn't resolving, confirming an email server is configured correctly, or verifying a TXT record added for domain ownership.

📍 IP Address Lookup

This tool looks up the geolocation, internet service provider, and network details tied to any IP address. It's commonly used to investigate where unexpected website traffic is coming from, check the location associated with a suspicious login, or simply confirm what IP address and region a connection is reporting as.

🎯 IP Tracker

Going a step further than a basic lookup, this tool adds reverse DNS and ping diagnostics on top of IP geolocation data — useful for network troubleshooting: confirming a server is reachable, checking the hostname tied to an IP address, or diagnosing latency between your connection and a specific host.

⚡ Internet Speed Test

This test measures download speed, upload speed, and ping from your current connection, giving a quick read on whether your internet is performing the way your plan promises. It's the tool to run before a video call, while troubleshooting a slow connection, or to confirm an ISP issue before calling support.

🎂 Age Calculator

This tool calculates exact age in years, months, and days between any two dates, handling leap years correctly. It's used for more than birthdays — figuring out eligibility ages, calculating someone's age at a historical event, or working out the precise time between two dates for a form or application.

💉 Blood Sugar Converter

Blood glucose is measured in mg/dL in some countries and mmol/L in others, which makes comparing a reading from a US device against international guidance confusing. This tool converts between the two units instantly — useful for anyone reading a glucose meter manual, a lab report, or medical guidance written in a different unit system than their device uses.

⚖️ BMI Calculator

This tool calculates Body Mass Index from height and weight, returning the standard underweight, normal, overweight, or obese category along with general context for what the number means. It's a quick starting point for understanding where a weight sits relative to height — useful background before a more detailed conversation with a doctor, not a diagnosis on its own.

🍎 Calorie Intake Calculator

This tool estimates daily calorie needs based on age, sex, weight, height, and activity level, using standard formulas to suggest a maintenance range. It's a starting point for anyone setting a nutrition goal, comparing how activity level changes calorie needs, or trying to understand roughly how much food their body requires before adjusting a diet plan with more specific guidance.

📋 Diabetes Risk Test

This tool walks through a short set of standard risk-factor questions — weight, age, family history, activity level — and returns a general risk indication for developing type 2 diabetes. It's meant as an early awareness check, useful for deciding whether a conversation with a doctor about screening is worth having sooner rather than later.

🩸 HbA1c Calculator

HbA1c results are reported as a percentage, but average blood glucose is usually discussed in mg/dL or mmol/L. This tool converts an HbA1c percentage into an estimated average glucose reading, making lab results easier to compare against day-to-day glucose monitoring numbers.

🤰 Pregnancy Due Date Calculator

Based on the first day of the last menstrual period, this tool estimates a due date and shows which week of pregnancy falls on any given date. It's a quick reference for tracking milestones, planning around an estimated delivery window, or cross-checking the due date a provider has already given against the standard calculation method.

😴 Sleep Cycle Calculator

Sleep happens in roughly 90-minute cycles, and waking up mid-cycle is part of why some mornings feel harder than others despite similar total sleep time. This tool works backward or forward from a wake-up or bedtime to suggest times that align with completing full cycles — aiming for a less groggy wake-up rather than just hitting a total hours target.

💧 Water Intake Calculator

This tool estimates a daily water intake target based on body weight and activity level, giving a general number to aim for rather than a one-size-fits-all rule like eight glasses a day. It's a reasonable starting point for anyone trying to be more intentional about hydration, particularly around exercise or hot weather.

Do I need to create an account to use these tools?

No. Every tool on EzyToolbox works without sign-up, login, or an email address — open the page and use it.

Is my data stored anywhere?

Most tools process everything locally in your browser, so nothing is uploaded. File-based tools that require a server step automatically delete uploaded files after 30 minutes.

Are the health and finance calculators a substitute for professional advice?

No. These calculators give a fast, general estimate, not personalized medical or financial advice. For decisions that matter, check the number against a doctor, accountant, or financial advisor.

Is there a cost to use any of the tools?

No. All 40 tools are free, with no usage limits, premium tier, or paywalled features.