Updated: 6 October 2026 · Original practical guides from the Toolinity editorial desk
Understand the result, not just the button. These guides explain everyday tasks with worked examples, trade-offs and checks. Open the Toolinity studio alongside a guide to try the steps. No account or document upload is required for the local tools.
Resize an image without stretching it
Image dimensions and file size answer different questions. Dimensions describe the pixel grid, such as 2400 × 1600. File size describes the storage used, such as 900 KB. A website can require one, the other, or both. Start by reading the upload requirements instead of repeatedly compressing the wrong thing.
Choose the shape before the quality
A 2400 × 1600 photo has a 3:2 aspect ratio. Reducing it to 1200 × 800 preserves that shape. Reducing it to 1200 × 1200 using Stretch distorts faces and circles. For a square output, choose Contain to keep the entire photo with surrounding space, or Cover to fill the square and crop the sides. Neither option is universally better: a product photograph may need its whole outline, while an avatar often needs a close crop.
- Keep the original image and open Image resize & convert.
- Select your own image, enter the required dimensions and choose Contain, Cover or Stretch deliberately.
- Choose PNG when you need transparency or crisp graphic edges. Try JPEG for a photograph where a smaller file matters more than transparency.
- Preview the output. Check faces, text, borders and the cropping around the subject before saving.
- Open the saved file in your normal image viewer and confirm its dimensions and appearance.
For a KB limit, use Target-size image compressor after choosing appropriate dimensions. For example, a 4000-pixel-wide photo intended for a 1000-pixel-wide upload is often better resized first, then compressed. Repeatedly saving a JPEG can accumulate visible damage; work from the original whenever possible. There is no quality setting that guarantees the same file size for every picture.
Limits: enlarging an image cannot reliably recreate detail that was never recorded. Browser support varies by input format, so an unsupported file may need conversion in a trusted device app first. The metadata remover re-encodes pixels; it does not redact a visible address, face or number in the picture.
Compare discounts and pack prices fairly
A large discount badge is not the same as a better purchase. Compare the final eligible price and the quantity you receive. Shipping, taxes, excluded products and minimum-spend conditions can reverse a result that looks obvious from the headline.
Percentage versus fixed discounts
For a price of 80, a 15% coupon saves 12 and leaves 68. A fixed coupon worth 10 leaves 70, so the percentage coupon is better before other charges. At a price of 40, the same 15% coupon saves only 6; the fixed coupon then saves more. The break-even price is the fixed saving divided by the percentage as a decimal: 10 ÷ 0.15 ≈ 66.67.
In Coupon comparer, enter the same base price for both offers. Do not assume coupons stack unless the retailer says so. Successive discounts are multiplied: 20% off followed by 10% off leaves 0.8 × 0.9 = 0.72 of the original price, or a total discount of 28%, not 30%.
Compare packs using one unit
A 500 g pack priced at 5 costs 0.01 per gram. A 1 kg pack priced at 8 must be entered as 1000 g; it costs 0.008 per gram and is cheaper by weight. Entering 500 and 1 would produce a meaningless comparison because the units differ. Convert quantities first, then use Unit-price comparer.
A cheaper unit price is only one consideration. A larger pack may expire before you use it, contain a different concentration, or cost more up front. For liquids, compare the same volume unit and product strength. For subscriptions, compare identical features and cancellation terms as well as twelve monthly payments versus the annual price.
Check before paying: use the retailer's actual checkout total, verify that the coupon applies, and allow for rounding. Toolinity performs arithmetic on the numbers you enter; it does not fetch current deals, validate coupons or recommend a seller.
Build a readable résumé and cover letter
A useful résumé helps a reader find relevant experience quickly. A decorative template cannot compensate for vague achievements or invented qualifications. Begin with the role's requirements, then describe evidence you can truthfully support.
- Write a short summary focused on the target role, not an unsupported claim such as “the best candidate”.
- List recent experience in reverse chronological order. Keep employer, role and dates clear.
- Describe responsibilities and outcomes in concrete language. “Organised the weekly inventory check” is more informative than “excellent worker”. Include numbers only if you can substantiate them.
- Add relevant education and skills. Avoid publishing identity documents, full home addresses or unnecessary sensitive information.
- Preview and print to PDF. Check the second page, spacing, spelling and any truncated text, not just the first screen.
Make the letter add something
A cover letter should connect a small number of relevant examples to the role. It should not copy the résumé word for word. Start with the position and why the work interests you, follow with one or two truthful examples, and end with a clear, polite next step. Replace placeholder company names and job titles before exporting.
Keep formatting simple when the application system needs selectable text. A résumé built entirely from screenshots may look fine to a person but cannot always be parsed by software. After making a PDF, try selecting and copying a paragraph; if you only get an image, revisit the export method.
Limits: the builder is a writing and layout aid, not a recruitment service. It cannot guarantee interviews or compatibility with every applicant-tracking system. Keep a local editable copy, inspect the downloaded document, and follow the employer's requested format. No local builder can protect files already stored on a shared device.
Turn images into a useful PDF
Combining photos into one PDF can make a set of receipts or reference pages easier to share. The result is an image-based document, not an automatically searchable scan. If you need searchable text or accessibility for a screen reader, this image-only workflow is not enough.
- Photograph each page straight on, in even light. Include all corners and avoid glare.
- Open Images to PDF and select the pictures you are authorised to use.
- Put pages in reading order and inspect orientation. Confirm that the first page is actually first.
- Choose a suitable paper size, margin and image quality. A smaller margin gives the picture more space, but text close to the edge may be harder to print.
- Export, then open the PDF and check every page at a readable zoom.
Large photographs multiply memory usage before export. Ten compressed images of 2 MB each may require far more than 20 MB when decoded into pixels. If a phone struggles, resize the source images to a sensible resolution or process fewer pages at a time. Do not remove so much detail that receipt amounts or small print become unreadable.
For confidential documents, check both the selected pictures and the final PDF. Re-encoding does not remove visible personal information. Rename the file clearly, save a copy on a device you control, and use the recipient's authorised sharing method. A PDF is not inherently encrypted simply because it is a document.
Limits: this tool does not edit arbitrary existing PDFs, perform OCR, apply a legally valid signature, or guarantee that a recipient will accept the document. The browser can also refuse very large inputs or unsupported image formats. Always keep the originals.
Estimate an appliance's electricity cost
The basic energy calculation is power in kilowatts multiplied by hours of operation. Divide watts by 1000 first. A 100-watt device used for five hours per day over 30 days consumes approximately 0.1 × 5 × 30 = 15 kWh. At a price of 0.20 per kWh, that part of the bill is about 3.00 in the tariff's currency.
Enter wattage, daily hours, days and the price per kWh in Appliance cost estimate. Use the energy price from your supplier's bill, not a guessed national average. Check whether the quoted tariff includes tax and whether it changes during peak periods. Standing charges and other fixed fees are separate from the calculation.
The constant-wattage assumption matters. A refrigerator, heater or air conditioner may cycle on and off. A label can show a maximum power value rather than normal average consumption. For these appliances, measured consumption over a representative period or the manufacturer's energy-use figures can be more useful than multiplying the maximum rating by every hour.
To compare two scenarios, change one input at a time. Reducing the example's use from five hours to three gives 9 kWh, a difference of 6 kWh. At 0.20 per kWh, the estimated difference is 1.20. This is an arithmetic scenario, not a promise that your bill will fall by exactly that amount.
Safety: do not open an appliance, change wiring or bypass a safety control to improve a calculator result. Follow manufacturer instructions and seek qualified help for electrical work. Toolinity does not inspect equipment or provide personalised electrical advice.
Choose a browser tool with privacy in mind
“Runs in your browser” and “collects no data” are different claims. A tool may process a file locally while its hosting service still receives an IP address and page request. Analytics, embedded media and third-party widgets can create additional requests. Check a site's actual notice instead of assuming a reassuring label covers everything.
Before working with a sensitive file, ask: does the tool require an upload, a login or permission it does not need? Is the output stored remotely? Can I complete the task in a trusted device app instead? For especially confidential documents, follow your organisation's approved workflow rather than relying on a general-purpose website.
Toolinity's upgraded file and text tools work in browser memory. Optional Google Analytics is used for audience measurement only after permission; rejecting it does not disable the local tools. The holiday calendar intentionally requests external country/year data when you press Load. External market and phone links take you to another site's practices.
Closing a tab clears this studio's in-memory work, but it does not delete downloads, browser history, autofill, device backups or copies held by a recipient. On a shared device, save results carefully and remove files using that device's normal controls. A metadata remover also cannot hide information that is visible in the image itself.
Our editorial approach: these guides are written for the implemented Toolinity tools and checked against their available controls and calculations. They do not include paid product recommendations or promise professional, legal or financial outcomes. When a tool's assumptions or providers change, its guide and privacy information need review too.