Need a printable document?
├─ YES → Is it for a Query/Script Report?
│        ├─ YES → Use JS Template ({%= %}), NOT Jinja
│        └─ NO  → Use Jinja Print Format
└─ NO  → Is it for email?
         ├─ YES → Is it triggered by workflow/notification?
         │        ├─ YES → Notification Template (Jinja)
         │        └─ NO  → Email Template (Jinja)
         └─ NO  → Is it a web page?
                  ├─ YES → Portal Page (www/*.html + .py controller)
                  └─ NO  → frappe.render_template() for ad-hoc rendering

{# ALWAYS use get_formatted() for fields in Print Formats #}
{{ doc.get_formatted("posting_date") }}
{{ doc.get_formatted("grand_total") }}

{# Child table rows — ALWAYS pass parent doc for currency context #}
{% for row in doc.items %}
    {{ row.get_formatted("rate", doc) }}
    {{ row.get_formatted("amount", doc) }}
{% endfor %}

{# General formatting with explicit fieldtype #}
{{ frappe.format(value, {'fieldtype': 'Currency'}) }}
{{ frappe.format_date(doc.posting_date) }}

{# Full document — use only when multiple fields needed #}
{% set customer = frappe.get_doc("Customer", doc.customer) %}

{# Single field — ALWAYS prefer over get_doc for one field #}
{% set abbr = frappe.db.get_value("Company", doc.company, "abbr") %}

{# List of records (no permission check) #}
{% set tasks = frappe.get_all("Task",
    filters={"status": "Open"},
    fields=["title", "due_date"],
    order_by="due_date asc",
    page_length=10) %}

{# List with permission check (portal pages) #}
{% set orders = frappe.get_list("Sales Order",
    filters={"customer": doc.customer},
    fields=["name", "grand_total"]) %}

<h1>{{ _("Invoice") }}</h1>
<p>{{ _("Total: {0}").format(doc.get_formatted("grand_total")) }}</p>

{{ frappe.get_url() }}
{{ frappe.get_fullname() }}
{{ frappe.get_fullname(doc.owner) }}
{{ frappe.db.get_single_value("System Settings", "time_zone") }}
{% if frappe.session.user != "Guest" %}...{% endif %}

{% if doc.status == "Paid" %}
    <span class="paid">{{ _("Paid") }}</span>
{% elif doc.status == "Overdue" %}
    <span class="overdue">{{ _("Overdue") }}</span>
{% else %}
    <span>{{ doc.status }}</span>
{% endif %}

{% for item in doc.items %}
<tr>
    <td>{{ loop.index }}</td>
    <td>{{ item.item_name }}</td>
    <td>{{ item.get_formatted("amount", doc) }}</td>
</tr>
{% else %}
<tr><td colspan="3">{{ _("No items") }}</td></tr>
{% endfor %}

{% set total = 0 %}
{% set name = doc.customer_name | default("Unknown") %}

# hooks.py
jenv = {
    "methods": [
        "myapp.jinja.methods"       # Module with callable functions
    ],
    "filters": [
        "myapp.jinja.filters"       # Module with filter functions
    ]
}

# myapp/jinja/methods.py
import frappe

def get_company_logo(company):
    """Returns company logo URL. Called as get_company_logo() in Jinja."""
    return frappe.db.get_value("Company", company, "company_logo") or ""

<img src="{{ get_company_logo(doc.company) }}" alt="Logo">

# myapp/jinja/filters.py
def nl2br(text):
    """Convert newlines to <br> tags. Used as {{ text | nl2br }}."""
    return (text or "").replace("\n", "<br>")

{{ doc.notes | nl2br | safe }}

<style>
    .print-header { background: #f5f5f5; padding: 15px; }
    .item-table { width: 100%; border-collapse: collapse; }
    .item-table th, .item-table td { border: 1px solid #ddd; padding: 8px; }
    .text-right { text-align: right; }
</style>

<div class="print-header">
    <h1>{{ doc.select_print_heading or _("Invoice") }}</h1>
    <p>{{ doc.name }} — {{ doc.get_formatted("posting_date") }}</p>
</div>

<table class="item-table">
    <thead>
        <tr>
            <th>#</th>
            <th>{{ _("Item") }}</th>
            <th class="text-right">{{ _("Qty") }}</th>
            <th class="text-right">{{ _("Amount") }}</th>
        </tr>
    </thead>
    <tbody>
        {% for row in doc.items %}
        <tr>
            <td>{{ loop.index }}</td>
            <td>{{ row.item_name }}</td>
            <td class="text-right">{{ row.qty }}</td>
            <td class="text-right">{{ row.get_formatted("amount", doc) }}</td>
        </tr>
        {% endfor %}
    </tbody>
</table>

<p><strong>{{ _("Grand Total") }}: {{ doc.get_formatted("grand_total") }}</strong></p>

/* v14/v15 (wkhtmltopdf) */
.page-break { page-break-before: always; }

/* v16 (Chrome PDF) — ALWAYS prefer break-* in v16 */
.page-break { break-before: page; }

// site_config.json
{
    "pdf_engine": "chrome",
    "chrome_path": "/usr/bin/chromium"
}

{% extends "templates/web.html" %}
{% block title %}{{ _("Projects") }}{% endblock %}

{% block page_content %}
<h1>{{ _("Projects") }}</h1>
{% for project in projects %}
    <h3>{{ project.title }}</h3>
    <p>{{ project.description | default("") | truncate(150) }}</p>
{% else %}
    <p>{{ _("No projects found.") }}</p>
{% endfor %}
{% endblock %}

import frappe

def get_context(context):
    context.title = "Projects"
    context.no_cache = True
    context.projects = frappe.get_all("Project",
        filters={"is_public": 1},
        fields=["name", "title", "description"],
        order_by="creation desc")
    return context