Guides that answer the question you actually typed
No listicles, no padding. Every guide here was written because someone was stuck — a form that will not accept their file, a specification that is not in the notification, a loan decision that needs arithmetic rather than a brochure.
How to compress a PDF to 100 KB (without ruining it)
A practical walkthrough of getting a PDF under a 100 KB upload limit: what actually takes up the space, which pass to use first, and how to tell whether you have made it unreadable.
Exam photo and signature requirements: how to check before uploading
A practical guide to application photos, live capture, signatures, pixel sizes and KB limits. Verify every requirement with the current official notice.
Why an application photo upload may be rejected
Check file size, image format, dimensions, visual requirements and the application session when a photo upload fails.
Passport and visa photos: size, framing and print checks
Understand the difference between print dimensions and a digital image, and check official passport or visa photo instructions before applying.
Old regime or new regime: how to decide before the deadline
A worked comparison of the two income-tax regimes, the crossover point where old starts winning, and the two mistakes that make the decision irreversible.
EMI or prepayment: where a home-loan rupee actually goes
An amortisation reality check: why a five-year-old ₹40 lakh home loan still owes nearly ₹40 lakh, and how much a single prepayment really saves.
How PDF compression actually works (and why most "compressors" are guessing)
An overview of PDF structure, image quality, resolution and the costs of rebuilding pages, including what this browser-based compressor actually does.
Compressing an image to exactly 50 KB: what to expect, and what to give up
What 50 KB buys in image quality, why the encoders step in whole quality units, and how to decide between a smaller canvas and a lower quality when the target is tight.
How to merge PDF files (and get the page order right the first time)
Combining PDFs is the easy part. This guide covers what merging does to the file, the order an application bundle should be in, and the four things that quietly break a merge.
How to split a PDF: extracting pages, ranges and single sheets
Split a large PDF into the pages you need: range syntax without the off-by-one mistake, when splitting beats compressing, and what happens to encrypted or signed documents.
Photos to PDF: page size, DPI and why your scan looks like a phone picture
Turn JPGs and PNGs into a properly laid out PDF: choosing A4 or fit-to-image pages, working out the DPI you actually need, and keeping the file small enough to email.
PDF to JPG and back: what you lose on the round trip
When a portal will only accept JPG, rendering PDF pages is the answer — but the return trip is not free. DPI choices, multi-page output, and how to avoid generation loss.
JPEG quality versus file size: the curve, explained without the maths
Why quality 85 is usually the sweet spot, why the same setting gives wildly different file sizes for two photographs, and what the quality number actually controls inside the encoder.
SSC photograph and signature uploads: check the current notice
A practical checklist for SSC live photographs and signature images, with links to official recruitment instructions.
UPSC photo and triple-signature upload: a practical guide
Understand the UPSC photo, live-photo and triple-signature steps, and check the official instructions before applying.
IBPS photo, signature, thumb impression and handwritten declaration: all four in one place
Banking applications may request a photograph, signature, thumb impression and declaration. Check the official instructions for your recruitment.
GST calculation, both directions: adding tax to a price and pulling it out of one
How to compute GST on an invoice, split it between CGST and SGST or file it as IGST, and work backwards from a total that already includes tax — with the slab structure as it stands today.
How SIP returns actually work: the compounding, the XIRR trap and the inflation you forgot
What a monthly SIP really builds to at a given rate, why your statement’s XIRR is lower than the fund’s return, and how to sanity-check a projection without believing it.
Age eligibility for government jobs: cut-off dates, completed years and relaxation
How boards actually compute your age for a recruitment cut-off date, why one day can decide an application, and the standard upper-age relaxation for OBC, SC/ST and PwBD candidates.
BMI for Indians: why the cut-offs are lower, and what to check alongside it
An adult screening guide comparing international BMI categories with lower thresholds used in some Asian-Indian research, and explaining why BMI alone is not a diagnosis.
How to email a large PDF: why a 20 MB file fails a 25 MB limit
Attachment limits are smaller than they look because email encoding inflates files by about a third. Here is the order of fixes that actually works, and when a link beats an attachment.
A4, Letter and Legal: PDF page sizes and the scaling trap when you print
Page geometry explained: which size your document is, what happens when a printer fits to page, and why forms that look perfect on screen come back with the last two millimetres missing.
How these guides are written
Our guides explain practical steps and common trade-offs. Requirements and rules can change; always compare exam and document specifications with the current instructions from the issuing authority.
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